I was running TTRS calipers with the 370mm ttrs discs, needed 10mm spacers to fit behind Huffs, but depending on what wheels you will be using a different size of spacer may be required.
Others have run with the 345mm discs from r32/s3's, but different brackets have been required to fit these, if you contact Daveb1970 here on the forum here, he will keep you right and also be able to supply you with the correct parts to fit.
He is a busy man, so hang in there !