83 Aerostar rear bumper replacement

Some one just rear-ended the van. Luckly it appears that the only thing hurt is the bumper. A trip to the library didn't help in finding any replacement instructions. I could have overlooked the correct book, or someone else was reading it?

Does anyone have any instructions or know where I can get them. I am assuming all the 93 bumpers are the same. Is this an ok assumption.
TIA

There are a few bolts on each frame rail under the van. The sides just slide on and off on rails. Remove the bolts and pull straight back. The complete bumper assy is all plastic, so if you need to break some of it you can use a saw.