As already said, the mk4 rear caliper swap is a must in my opinionI get the lines made up by a company called HelU use the mk3 carriers, in only need the mk4 caliper it fits as tho it was made to fit
You saying the rear mk4 caliper never seize? Come along to the mk4 section and read the seized caliper threads Top install Looks like it just came out the factory!!!