[Milsurplus] Wanted: National NC-100, NC-120, NC-156 Tuning Unit Rack Bushing Replacements

[DeWitt Clay]

Does anyone know of a source for replacement bushings for the tuning unit guide 
bar i.e. the bandswitching mechanism for the NC-100 Series of receivers? Or a 
good substitute?
73, DeWitt  N4QNX