Going for that ultimate "old-school" look?  These detailed plastic non-planetary style wheel hubs are designed with a rough "cast" finish, and have stainless steel M4 inserts pre-installed.  Sold in a complete set of 4 and available in black, grey, or red, 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:  These hubs may require use of "blue" loctite upon installation.  Will NOT fit the JConcepts, Pro-Line, or RC4WD wheels.