Looking to replicate the "directional" center wheel covers Bigfoot ran on many of their mid-90s trucks?  These 3-dimensional covers are designed to screw right on to your stock Clodbuster stub axle threads and have stainless steel M4 inserts pre-installed.  Sold in a complete set of 4, these are a direct replacement for your stock wheel nuts.  These will fit stock Tamiya, Imex, and CRP Clodbuster wheels with no modifications required.

Note:  Adding blue loctite to the axle threads is recommended.