Ok, so here is my bolt on 8.8 diff gaurd. I used what I had laying around, so it isn't pretty, but I think will work for awhile. I cut and used a 8" ID pipe with 3/8 wall thickness.
Originally I made a couple of horrizontal cuts (not all the way through) to allow the 5" wide strip to flex out so it would span the diff cover hump. When I welded those cuts up afterwards, I failed to clamp the whole thing down, and after adding the side support "hoop" as well, it warped. Soo....... I had to cut it all the way through one of the horizontal welds I just did, flexed it down, (this time bolt it in place) and did short one inch welds (letting it cool in between welds) using a piece of steel as a filler in the new gap. It's strong, but not as clean looking as I planned. sigh.