All you need to know is the year, 1985 and earlier W126's used slightly different brakes than 1986 and later.

The type of the caliper doesn't matter; ATE, Bendix or whatnot.

Also don't forget to replace the rubber brake lines, very often they can fail internally and cause the caliper to stick. Good cheap preventive maintenance on a 20+ year old car.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200