Brake caliper rebuild advice

[Dave8819]

Hi guys I'm having some issues in regards to my brakes. So I bought the car and I was told the brakes had been replaced and you could see they had been but the discs had lips around the the top where the pads hadn't been touching but after driving the car hard and using the brakes hard the tops have become slightly cleaned but I now think my front passenger side piston is sticking as I can hear a chuffing noise when cornering to the left so I'm assuming the pad is rubbing against the disc . So I'm looking a set of second hand calipers to refurb and and rebuild myself. I have never rebuilt calipers before but I do have a rough idea what's needed. So any advice on a rebuild appreciated also what other model shares the same calipers that I could use? Also when refurbing the rears would I need to change the parking brake motors if they aren't seized?