hey guys tried searching but havent been able to find alot of info on it but anyway im looking at putting some weld racing wheels prostars on my vl. would be looking at 15 x 8s on the rear and a bit smaller on the front maybe 15 x5s. aparently the 5x120.65 (5x4.75) will fit but you need to use arp wheel studs. the next thing i need to know is what back spacing to get the diff has been shortened 20mm each side and the front is obviously standard. any help would be much apreciated i havent had any luck finding this info out over here in nz so yeah thanks