SM6199 StewMac 10-24 thread replacement truss rod nut for vintage Fender (approximately '54-'59) SM6198 StewMac 10-32 thread replacement truss rod nut for vintage Fender (approximately '61-'70s and reissues) SM6200 StewMac off-set spacer for truss rod repair SM6202 StewMac off-set spacer for truss rod repair