Finally after years of searching for these gears I found some that work! most early R129's seem to be affected by original gear breaking 89-92, these are the gears responsible for forward and reverse seat movement, from my research those early years had white nylon gears that cracked, then in 1993 they switched to a stronger black plastic, you can buy a set of used worm screw mechanisms off the internet priced $65-$300 or dealer $750, if they even sell them in 2021, save some money and just replace the bad gears! note: if you have an early R129 don't buy used mechanism for your exact year! 1993-2002 should be fine, early one's break unless they have been retrofitted with stronger gear.
In this video I'm reviewing 3 sets of gears that have worked, the black ,grey and white, all worked just fine! if you need to fix your R129 with bad gears just replace them and save your money for something else!
I purchase mine on eBay thru this seller in Hungary and arrived in a timely manner.
Link down below for seller on eBay he is currently out of stock as of 6/6/21 but printing some out and will list them soon , he also prints head rest gears for R129.
Here's the link to get them!
[ Ссылка ]
