Please post some pics of the mounting area.
Those 320 tweeters are big, and you need clearance to get them on the bayonet mounts.
Good choice though, old a/d/s/ stuff is awesome.
A couple other things to watch for: Depending on how the door panel fits up you may need to build a recessed adapter for the woofers- they stick out the front a LOT more than most speakers, and can be damaged over the years from hitting against door panels. Also check the integrity of the glue holding the large coils in the crossover in place. I've seen a number of those coming loose after years of use (although that seems more common on the 325is).
(a/d/s/ retail sales person of the year- 1997)