I want to rebuild/refurb a set of ropey 4-pot calipers with a brand new piston/seal kit/paint in heat resistant red, etc.

So I'm after a set of old, unloved calipers were my only concern is that the main body of each one is okay i.e. no cracks, chips, etc. If the seals and/or pistons are perished or sticking, then that's not a problem. So long as they're 'cheap'...

Either that, or a set of reasonably priced, already pre-refurb'd/pre-painted (OEM red) ones would do the trick...