you mean like vacuum caps? i am pretty sure I just got those at autozone but I have a billion on them in my toolbox, I am happy to include some.
I don't recall the breathers coming with any.
it depends on what isn't clearing on the wheels. typically the brake calipers hit near the hub or spoke curvature, not the outer rim fitting over it. PP brake rotors are 15 inches, the caliper probably sticks up only another inch or two. it's caliper width that becomes the problem, not the...