vented rotors or not vented rotors. That is the question. Older 6.3's had vented rear rotors. The calipers for those won't fit on anything else. The later ones had solid rear rotors and should be the same as the other 108/109 v8 cars. You can confirm that with a free online registration of the US EPC.
But if you have a 4.5 rear, didn't it have calipers?
If searching here didn't find any threads on the disc brake upgrade for the W110/W111 cars, try the sl113 dot org forum. It's also a popular upgrade for the 230sl.
-CTH
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