bryan mentioned Marks post so I had to go looking,
A while back I bought a rustey old S-10 to plow with but things didn't work out as planned and the transmission went in the s-10 so I am taking parts off of it and using it as a yard truck only. These step bars were on it and I am going to make/adapt brackets to fit them on my lifted Astro.
www.astrosafari.com
I have brand new running boards and back ladder for a rear door that came with it when I bought my '05 and haven't installed either. The ladder I won't put on as I'm sure the ladder or the steel of the door will fail, seen too many of that type in the junkyards.
The running boards Westin 276130
I just haven't made up my mind on, If I use them the hardware will need to be reinforced. Most of the 5 brackets bolt to the back of the rocker with 10 mm screws, drill a 3/16" hole and run the screw. No bueno considering my partner in crime / son weighs in at 260 w/o toolbelt will be standing on them tying, untying loads on the rack the boards need to be strong and not just look pretty.