Found this one listed on
www.car-part.com as they link various yards together via their computer network. Local craigslist usually will have people parting out their T-100 but since yer in the rust belt...I'm gonna venture their back bumper is gonna be the same condition. You could also try eBay as I've seen some on there but I think those are strickly aftermarket.
This was listed under painted rear bumper assembly.
1995
Rear Bumper
Toyota T100 GRN,STREET 000 A
0 8155 $Call Westover Auto Salvage USA-MA(Belchertown) E-mail 1-800-358-5100
Here's a chrome one in Oceanside, CA fer $40 OBO plus shipping (if they will ship). You'll have to work out the particulars if yer willing to risk it.
You could also git a custom rear bumper made, too...but it's not gonna be cheap.