SKU: 7913145564

RAM Double Ball Mount with Round & Diamond Bases - B Series - Long Arm

Sale price$89.95 Regular price$99.95
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Description

RAM Double Ball Mount with Round & Diamond Bases - B Series - Long ArmRAM B 138U C RAM Double Ball Mount with Round & Diamond Bases B Size Long The RAM B 138U C is a drill down mounting solution pairing a round AMPS base and a diamond AMPS base on a long B Series double socket arm, giving extra reach with near infinite adjustment and two mounting hole options. Key Features Round base with the universal AMPS hole pattern for surface mounting; diamond base with the 2 hole AMPS pattern for lighter device holders Includes

RAM-B-138U-C RAM® Double Ball Mount with Round & Diamond Bases – B Size Long

The RAM-B-138U-C is a drill-down mounting solution pairing a round AMPS base and a diamond AMPS base on a long B Series double socket arm, giving extra reach with near-infinite adjustment and two mounting-hole options.

Key Features

  • Round base with the universal AMPS hole pattern for surface mounting; diamond base with the 2-hole AMPS pattern for lighter device holders
  • Includes one round ball base, one diamond ball base, and a long B Size double socket arm for extended reach
  • Ball-and-socket technology allows near-infinite adjustability and dampens shock and vibration
  • Powder-coated, marine-grade aluminium construction
  • Backed by RAM Mounts' lifetime warranty

Works With

The round base bolts down using the 4-hole or 3-hole AMPS pattern, while the diamond base connects to RAM® and many third-party cradles with the 2-hole AMPS pattern. The 1" B Size balls suit any RAM® holder built for a B Size ball.

Dimensions & Specifications

  • Overall height: 185.7mm (7.31")
  • Arm length: 152mm (6") overall, 134mm (5.25") socket-to-socket
  • Diamond base: 61.7 x 33.3mm (2.43 x 1.31"), 2-hole AMPS 48.6mm (1.912") centre-to-centre
  • Round base: 63.5mm (2.5") diameter; 4-hole AMPS 30 x 38mm, 3-hole AMPS 120° 46.0mm
  • Ball size: 1" rubber ball, B Size
  • Material: powder-coated marine-grade aluminium
  • Weight: 331g (0.73 lbs)
  • Load rating: 907g (2 lbs) standard use, 454g (1 lb) heavy-duty use

What's Included

  • RAM-B-202U round base with 1" ball
  • RAM-B-238U diamond base with 1" ball
  • RAM-B-201U-C long double socket arm for B Size 1" balls

FAQs

Q: What size screws do the base plates take?
A: The AMPS patterns most commonly take #8, #10, M4, or M5 screws. If you're pairing this with a RAM® holder, the holder comes with its own hardware; surface-mount hardware for your own application isn't included.

Installation Video

Watch on YouTube

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 7913145564

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4.4 ★★★★★
Based on 6 reviews
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Verified Purchase
JimXeod
Cuba, US
★★★★★ 5
Fits perfect and works as designed. Flows like OEM and looks well made.
Style: BE-553B 1-Pack
This filter is very comparable to the stock filter. Fits the BMW G20 just like OEM. I would not say it is two times "heavier" as advertised on the box, but it is very comparable to stock. It's the same weight and similar construction. BMW has a very robust cabin filter. This will be my go to. I did purchase another aftermarket cabin filter that fit well, but was thin, flimsy and had a bad chemical odor. This one is fine and airflow is the same as OEM. I change them every year or so. I don't worry too much about longevity with cabin filters personally.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
S
Verified Purchase
S. Phillips
Natrona Heights, US
★★★★★ 4
Good quality but it was slightly longer than original and needed modification.
Style: BE-182 1-Pack
Bought this cabin filter for a 2023 Acura TLX. While the filter seems to be made of quality material, it was just a little too long (about a 1/16 of an inch, so I had to trim it to make it fit so the cover would fit snug. I was able to do that without compromising the filter itself. But this might be an issue for some people
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
K
Verified Purchase
Keith Granholm
Phoenix, US
★★★★★ 5
Fits my Chevy 2021 Bolt Premier perfectly.
Style: BE-966 1-Pack
Installation was a breeze, fir nicely and the air in teh car now smells fresh and clean. The old filter has developed a musty smell so this new one is great. Had it replaced in under 3 minutes.
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Reviewed in the United States on May 18, 2026
P
Verified Purchase
Punkizback
Belleville, US
★★★★★ 5
Fits perfectly for my 2017 VW Passat
Style: BE-373 1-Pack, Style: BE-373 1-Pack
Bought this for a fraction of the cost. An auto shop wanted to charge me $72.99 for a filter so I bought this Spearhead brand cabin filter and its the perfect size and its just as sturdy as the previous one the dealership had in the car. Not sure yet how the airflow is or if anything different as I have not driven in the car since it was replaced, but it appears to be a very high quality cabin filter for my car at a great price.
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Reviewed in the United States on May 25, 2026
S
Verified Purchase
SBJ
Charlottesville, US
★★★★★ 5
Good Quality Replacement for Lexus
Style: BE-285 1-Pack
Was a perfect fit for my 2016 Lexus NX200t. No tools required. Total of 5 minutes to install. Airflow is good after replacement and the activated charcoal seems to make a difference in reducing any smells from outside. Recommended.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2026

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