Up for sale is one 20" 3/8 diameter oring used in the 2 piece bolt together military wheels this fits 95% of the military wheels, works perfect in the standard 5 ton super singles that come on the M923 style truck, it will work in just about all 20" wheels but you might have to stretch it a little, some orings that come out are a little smaller diameter but this will work it there place. feel fee to call or email with any questions thanks C&C Equipment 812-336-2894