This has a listing of most of the CAST parts released for NA/Global: CAST Part Database
It was kind of dumb to make all the CAST sets in boxes with no way to preview them in game, but that link should help to some degree.
I was about to complain that I had already seen that page, but actually, it's been updated with things from the scratch, so it's good to see it's being filled out.
Still sorta sucks that the set I've been looking forward to still doesn't seem to be in Global. Ah well...