could anybody help i have just got hold of a mint rs 4 spoke s wheel and boss tried to fit it to my saff cos 2wd and about 1mm of the boss is just catching the bottom of the bit that sticks out where the s lock gos through. i just wondered if theres 2 types of boss, the number on the one ive got is 5012678 if thats any help feedback would be much appreciated thanks