I just used a set from Odometer Gears last week. Very easy to do. I gave him a call and he walked me throught it. Really nice guy. The only down side is the gears seem a little loud. i am goin to try som lithium gease to see if that quiets them down. If it doesn't he said he would try a different type of material.
I suggest buying a full set of gears (3). At first I had one broken gear, but after I started taking it apart the others fell to pieces.

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'87 300SDL
'91 BMW M5