I was in a junkyard while on a vacation to Maine...yeah i go to junkyards on vacation!
but I remember seeing a few 4th gens and alot of 3rd gens. At the time I owned a jeep and not the Z so didnt really care about the 4th gens but the reason i remember was cause there was a (id say 1998-2000) WS6 Trans Am there that was rolled in on the back of a flatbed when i got there, they rolled the back half off the truck first and about 5 minutes later they rolled the front half off!
Anywas i was in a junkyard in lacey township a few months ago that had a messed up 4th gen T/A & 4th gen 6 cyl Firechicken. The TA was well picked over and the 6cyl had nothing of use. 4th gens will be hard to find in a junkyard! I have been to many (and I mean many) junkyards and can hardly remember any 4th gens. Try Tighlmans Junkyard on rt.68 in colombus for any 3rd gens they may have some!