I set a young High School student up with a 500C rig a while back, as a gift and because I was watching pennies, I bought a cheap chinese (or where ever they come from) strap, hoods and plastic dark-slide and film reminder holders, that stick onto the back of the older A12's etc, once done the film back looks like the later model film backs with it built on as standard, if you know what I mean.
It was well worth, it and saved quite a few $$$ from buying genuine!!!, apart from the hoods being plastic you can barely tell the difference between these parts and the genuine thing , it was news to my old factory trained Hasselblad tech that still works on these for me (keeps mine in tune for a token cost every year) and has all the parts still..he looked at the dark-slide holder and the other parts and agreed it was a bargain and money well spent as well..as an aside, he laughed too, as we were discussing just how many kids would ever of got to have there own Hasselblad for High School photography class in the old days gone by, not very many!!...kids dont know how lucky they are
