it might be a stupid question but... if you don't know you should seek advice!!! recently i bought genuine fender pickup and bridge covers as well as a thumprest to install to my fender precision classic 50's bass. it has the gold anodised pickguard with pre-drilled holes for the thumprest and the pickup cover but ... they don't seem to match with the holes on the cover and the thumprest. the differences in distance are small but they don't match!!! what should i do for a proper installation? thanks in advance!!!