I'm not sure about shims for the back (I haven't done rear suspension work on this car either). But Fastlane does not list shims for the rear. Maybe someone else can answer that question. Or call Phil (the 888# at the top of this site). I've dealt with him, and he is fantastic. He really know his stuff.
But even if there are shims for the back, I doubt there's a 1-1.5 inch range in defference between largest and smallest. After all, the range for the front is only 5/8".
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'74 Honda CB 550F