If your roof box or canoe hangs past the MOS UpLift arms, these J-Extensions add 10 inches of mounting space per arm while keeping the 125-lb load capacity, so you can carry wider gear without replacing your rack.
When your roof-mounted gear needs more room than the MOS UpLift (MR39ZV - sold separately) gives you on its own, these J-Extensions add 10" of mounting surface per arm. That extra space gives your setup more usable arm length while keeping the load where the UpLift can still carry it.
The set includes 2 extension pieces, one for each arm, so your MOS UpLift gets matching added length on both sides. Once installed, your gear has a wider mounting area to work with instead of crowding everything onto the original arm surface.
Adding length shouldn't make the rack feel like a compromise, and these extensions maintain the full 125 lb load capacity. Your wider roof-mounted setup can use the added mounting surface while staying within the same rated capacity limit.
Powder-coated aluminum and stainless steel hardware keep the pair to 2.5 lbs, so adding them doesn't pile much extra weight onto your rack setup. They give your UpLift more mounting surface while keeping the added parts simple to handle during setup and removal.
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