A Baja bumper is a tubular affair that bolts to the front or rear of the Baja Bug. The tubing is heavy gauge.
Rear Baja Bumper
I have the type of rear bumper that bolts to the shock mounts, and to the rear transmission mounts. Welding was required to fit this. Sadly, I bought it at the Manassas Bug Out from Jarrett Import. Jarrett has a big trailer of parts, good prices and nice sales people. They also didn't include instructions, and failed to mention the welding thing. None of the parts I bought from them had mounting hardware. I have a skid plate and I have only a vague notion how it is suppose to mount to my bug.