that looks about like the same hight as the set of H&R springs i was running for a bit. as for the wheels maybe 16 or 17's. i ended up swapping them out for w126 springs cut to a slightly higher ride hight i found the H&R springs to be to soft for my taste they were basically the same as stock but lower. the w126 springs are much stiffer which helps me since i live in the mountains. if you are interested i still have the springs and the billstein part numbers for the B8 shocks with the lowered valving to work with the springs.

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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P