Because, Gordon, I drilled mine out and if I've gone too far, I'd like to have extras to go back to. I followed Hondaman's advise on drilling them (although his advise may not have pertained to a '76 model) I took all of the holes to .039" in four test rides. I checked all of those sites out and I didn't find anything. Next step is to start emailing them, but I figured someone here would know. If I HAVE to, I'll solder shut a couple lower holes and redrill smaller holes, but all in all, I should be ok.