This is another possibility for 3rd gen 4Runners. It was built by Layne at Denver Off-Road. What's unique about it is it's made of thick aluminum, so it's extremely strong and intended for abuse off-road with mounting a winch in it. Most of it is 3/8" thick 6061, so it doesn't bend. The bumper itself weighs only 54 pounds, plus various steel brackets to the frame weigh another 22 pounds. He built mine in 2001 and he does have the pattern to reproduce it "off the shelf" without your truck being in his shop. The name of his business is still Denver Off-Road although he now builds his bumpers in Fruita, Colorado. He mostly builds aluminum bumpers for full size trucks. He works with a powder coater near him. I'm really impressed with mine being powder coated now although I had mine natural aluminum for years too.
He doesn't have much of a web presence, but you can get his phone number off of his web site:
Denver Off Road
Edit - since this is a serious off-roading bumper, the manufacturer was not confident to utilize the frame end caps that are practically tack welded to the end of the frame (and I agree), so plan to cut off the frame caps. His frame mount wraps around 3 sides of the frame there and is bolted multiple directions in the area where the vehicle tie-down/stock tow point is located. His mount is fantastically strong to reliably hang your vehicle off of a 10000 pound winch.