'84 190D rear calipers

[curtludwig]

I need to do the rear brakes on my '84 190D but I need to know which calipers to get.
My local CarQuest says I need to know if I have a 1 1/2" inspection hole or not. One of the online suppliers I've used before asks the same question.
Pelican Parts doesn't ask that but offers me "NuGeon Reman" which doesn't make me all that excited. The "Genuine Mercedes" are only a little more.

Any advice here?

On the subject of pads Pelican Parts lists Akebono which nobody else does and interestingly only for the rears. I've got ceramics on the front, I forget the brand, they're okay but nothing super. I've got Akebonos on my pickup and they're fantastic.

Including Rock Auto in my search gives an amazing variety of parts. I assume 90% of them are junk...