No bushing, guide rod, or plug on post-war kits, though most that I've seen pictured in the last ten years will have had some or all added.
What's the address on the other side of the slide? I've seen them with COLT'S MFG. CO., and COLT'S PAT. F.A.; the former is a '50s address that covered the transition from the earlier Coltmaster rear sight to the Accro.
EGW makes #2 slide stops, if you can't find an original.
"A grip safety is just another excess moving part. I have never known one to prevent an accident, and moreover, it is difficult to postulate a circumstance in which it might." Jeff Cooper