I just got a Pentax K1000 second hand. The camera is great, but it is missing some of the lens caps. I know with how my luck goes, I'll have them scratched in no time flat. I have with it a 50mm 2.8 lens that needs both front and back caps. It says on it "SMC Pentax-A". I'm not sure what that means. I also have a Takumar 70-200mm 5.6 that is missing just the rear cap. Any idea where I can find replacements for these? Thanks!