front subs

Hey everyone... looking for a little help for some friends of mine. A friend of mine has a 98 concored with the Inifinty sound system. The left side door sub has blow and I was wondering what the replacment size is... Im thinking it should be replaced with an infinty kappa or reference woofer but the only sub sold by itself is the 6 1/2. Crutchfield said that it is a 6 3/4. Will the 6 1/2 fit? Well i appricate any input. Thanks folks

The speaker is going to be a little off but should work.
If your friends really worried about it he can pick up an adapter for it.
I think cardomain.com sells, or check crutchfield first, since thats where he's lookin for the speakers.