Ok, I thought I knew the corect O-ring for 12-bolt rims till I found out there is a newer design 12bolt rim. These are the newer ones rated at 3850lbs vs the older 12 bolts being 3500lbs. The quick way to tell the difference is the newer ones have a 13th hole. stolen pic: Anyone know a good (cheap) source for the red o-rings for the newer hummer 12-bolt rims? These are the two part numbers: 12342633 Black radial wheel 12460338 Red radial wheel The NSN for the red one is 5331-01-417-1043. The problem is these go for $23 each at a HUMMER stealership. Does anyone know the specs so I can order from a non-Hummer source? Thanks.