Judging by the part number it is 19 x 8.5 that were on the RS500. If you don't want to wait they are here http://pumaspeed.co.uk/product_categ...D=6&modelID=25
or you can talk to a few people in the UK for them. I was quoted 1100 GBP shipped to my door in VA for them. You need at least a 5 or 10 MM spacer to get them to fit right from what I was told by my friend in the UK.