There might be an issue with using the rear flex disc on the front. They are sold with two separate part numbers. So there must be a difference. They do appear slightly different, but I don't know what issues would be caused by using the rear disc for the front.

Surprisingly the flex disc you removed is in good shape compared with how they typically look.

Here is a picture of the front vs rear. You can see the front has off-center eccentric looking mounting holes while the rear does not.

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http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...

Yes, I do see the difference.....hmmmm, But the thickness seemed the same and I did not noticed the holes until you showed me this picture as mine was so mangled and every single bolt was actually just wobbling in the hole as the metal center fitment broke loose from the rubber, which explained the constant clanking noise I heard. Anyone, know of any adverse reactions to using the rear disc in the front? BTW, car seems to drive alot quieter and smoother

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1990 190E 3.0L

Looking at the pictures above, it seems like the front one, with those elliptical washers and reinforcing berm of material on the one side of them maybe gets more stress or compression, perhaps from the direct torque of the transmission, than the rear one does.


Obviously just naive conjecture, but there's must be some good reason for the differences. The front one is more expensive than the rear as well so there may also be structural or other differences that are not apparent or visible.