I couldn't find anything in the archives, so i tried it myself. Oh yes, they bolt on nice, work slick (as they were 10 years newer than my '72's) blah blah blah, but they're too short. I guess the mount points for the 320 are a lot further to the front than the 2002 ones. And whatever those things you 'click' your belts into are half the length, plus they're not 'stiff' and just flop to the floor.
so survey says; don't bother with 320 front belts. And while we're on that subject, I also tried belts that i had lying around from a '85 Prelude.... they don't work either :)