kelsey hayes 4 piston caliper rebuild

Hi all
I just collected parts for a disk swap on my 65 cuda and one of the 4 piston KH caliper has pitting in the cylinder.
I am wondering if resleeving was still a way to repair or just go to caliper one os similar and order a rebuilt?? one..

Thanks for your help.....
and if you have a passenger one laying around let me know..
Thanks
Ed