It came off an '80 I think. Got it for $15 at the Pull-A-Part yard. No mod needed. I used the factory mounts ( I took the shocks and all off the e21) and fabricated the mounting tubes from galvinized fence post material. I squashed one end in the vise to accept the bumper end mounting bracket, slid the pipe into the mounting points until I had the bumper where I wanted it, marked the spot on the pipe thru the bolt holes, drilled and mounted. Super easy. If you go to a salvage yard, be sure to take the shocks with the bumper off the e21. It is the easiest way to remove the bumper...just two bolts and they are reasonably accessible.