A friend of mine thinks that I'm a wuss because I put straplocks on my new American Vintage '62 reissue Strat, its kind of the same thing...
I just remember that all of the basses that I saw in 72-73 (when I first really got obsessed with Ricks) had the metal PU cover and the flat trussrod cover, and then in 74-75 they started having plastic covers and raised letter nameplates, which I didn't care for as much...
But hey, they ARE out there, and I found one for my old 4003S a few years back, I'd just recommend going to guitar shows and checking with all the parts vendors that are there... I'm still waiting to hear from Bob Young about when the next Lima Peru Guitar show will be....

i dunno about spacers or anything as i hate the covers and take them right off