original shocks were semi-flat-black. If you use KYB f.e. remove the rubber grommets, sand and spray the shocks semi-flat-black with some fog and press in the rubber with some soap. This will keep the rubber look natural and prevents chipping paint.
Ha! I asked Koni what color they painted their shocks when they rebuilt them, expecting some exotic color code of red/orange and they said they use Sherwin Williams bright red! Yes, I know, this has nothing to do with the correct original color, but I found it amusing and thought I would share.