Made it to the junkyard today (out of necessity, broke the Kia thermo cover for my reroute and had to get another). Didn't find any Tributes but there were some older 626s with the V6 engines. Looked at one and the IAC is completely different, it would require the use of the throttle body and the bolt pattern is different. There still might be something out there but for now I'm going to forget about it. In any event, for some strange reason since getting my car back together today the idle has been ok with no dipping. If it stays good then I'll just adjust it as it's a little high currently.