reubencahn:I ended up removing the innertube from the bottom slots and using keepers. The innertube didn't hold the webbing in place as firmly as I wanted. But I have a FredT finished plate and the edges are not self-locking.
It takes a little more work to thread the tube and webbing thru the tri glide, but it will fit.
It should be again stated: This webbing has a strength to lift a car, and the 1/4" tear the plate caused my first time out (before I knew enough to de-burr my plate and when I was significantly over-weighted) was in no way a safety concern. It was simply an eyesore.
K