My '88 560 has the same arms as a 420 my '86 560 has the aluminum versions. Calipers are on the trailing side in the '88 and leading side on the '86.

My understanding was that the 86/87 560 has the anti-squat control arms and subsequent models did away with them. Sub frame attachments are the same but there are some differences in brake mountings and other bits. Might have to swap sides on the calipers to get the bleed screws pointing up, etc? Worth a close look to be sure before you get too deep.

Also, make sure that the fulcrums are good, weird noises and clunks will follow if they are sloppy.