So, I grabbed an ATE caliper off a W126 at the junk yard to practice rebuilding it. I got to the point where I need to install the dust boots and the metal ring that fits on the caliper side is too large to fit in the groove. The rebuild kit is ATE branded and I selected my model and year when ordering the kit. Either the kit I ordered is not correct or the caliper I salvaged is different than that what may be specified for my car. Is there a difference between ATE calipers on the W126 series?

The caliper I am referring to is from the front left wheel.

Thanks.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge