who is this "they" you speak of? if anything there's MORE parts available now than there ever has been.
what is getting harder to get?
(please submit a list in haiku form only)
there is only emissions rules for cars that are 1976 and newer. anything before that, they could hardly give a crap about. and even for the stuff that has to face the smog test gauntlet, if your stuff runs clean (and it should) it's a non issue.
it's *slightly* more nuanced than that, but it's not like we're out here crushing 70's cars like it's 1994 1/2