The RF Meyle 'HD'
collapsed on my 300SEL in four days. Yes, four days. Go OEM MB for the 300SE/L W126, I have had it on the car for two years now with no issues.
Compare how the SDL and V8 mounts appear, they look nothing like the M103 mounts. Not sure how you could use those in place of the M103 units.
One of my E23 BMWs has Meyle upper and lower control arms, in sub 10000 miles of driving one of the ball joint boots has split and the others are close to doing the same. That is what I get for trying to save $20 each.
Meyle is crap, same boat from China as Uro.