It seems there were 3 different makes of calipers available for my 1990 300SE: ATE, Bendix and Girling. My originals were ATE all the way around, so that's what I replaced them with. It's easy to identify the ATE and Bendix calipers because they have their names embossed right in the outside center of the caliper. Sometimes the "te" in "Ate" is faded, but that large capital "A" is usually pretty discernable. You can check some out in the parts store here just to see what type you have.