you can make your own backing plate from a piece of bar stock you can pick up at HD box store if you don't have any on the shelf. it is a flat piece on the 88 v. it should be flat on most.
mine crumbled like a graham cracker when I checked it last year after being warned here about them rusting out. I cut and drilled a new one from a piece I had. Use new lock nuts, don't over-tighten. You can shape it to a v if it needs it.
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