B&E Electronics has a reasonable selection of enclosures, if you can tolerate the "this isn't my chosen career" attitude of some of their staff. They can be downright snotty.
A lot of the run and start caps are available online quite readily on Amazon, but also try furnace and air conditioning supply houses. Some won't sell to you unless you have a ticket, but Lennox on 86 Av SE is great. The staff are helpful too, which is why I like their products. I can always get parts. Most start and run caps have some leeway with respect to mF ratings, just watch voltage.
I'll let others chime in as my knowledge is mostly at the electronics level, as opposed to motors. I'm sure motor repair shops have parts available locally Howard.
Best of luck.