I got lucky and found this NOS step bumper (still in the box) on a local C/L post. The guy only wanted $135! Some days the bear eats you, and some days you eat the bear:
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Sorry don't mean to gloat. If you don't want to wait around for something like that to fall into your lap, look into Fey bumpers. They are marketed by Westin Automotive. They aren't like OEM quality but I have had two of them and - if you take care of them - they will last quite a while. They come in chrome or painted (silver or black). When I say take care of them, I mean to keep a close watch on the backside. Especially where the top step meets the bar (i.e. the vertical piece of steel that actually bumps into things). They look sharp and are all intents and purposes identical to the OEM design.
Before replying, I checked to be sure they are still available - they are. Just out of curiosity, I ran your truck numbers. The chrome version lists for $414 and the silver painted style is $231. Here is what the chromed bumper looks like:
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http://www.westinautomotive.com/fey-diamond-step-bumpers/1987/gmc/v2500
Another bumper that I have had on my truck is the Starlite from LMC. I really liked the rear facing mini headlights. They came in real handy out in the woods. That was another C/L find - for $50. IDK how much they are from LMC - now I do, $230. I can't vouch for how well they hold up over time. I lost my truck in a fire after only about a year of installing it. They come in plain chrome or chrome with a black step surface:
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