Well after doing more looking around, I noticed that the C4 front knuckles look a lot like the C5/6 knuckles....except that the upper ball joint is not captured in the knuckle. Im sure that there are some dimensional changes in there too but it may work for me. I can just put some C4 hubs in there I think and run the front CV shafts to that.
Here is a C4 knuckle
http://cgi.ebay.com/ebaymotors/91-92...#ht_500wt_1182
That one has the hub area wide open, Ive also seen ones that are closed off. Could I just cut that hole open if needed?
http://cgi.ebay.com/ebaymotors/88-89...#ht_500wt_1182
and the C5 stuff
http://cgi.ebay.com/ebaymotors/1997-...#ht_2260wt_941