8 3/4 wheel adapter flange.

I could not find in the factory service manual. I torqued 50 so I’m a little shy. Thx
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Those adapters were allowed at the strip way back. They worked surprisingly well IMO.......until you sheared the stock 7/16" lugs with slicks after several passes. The tire rolls out the back and folds up the lower rear quarter on the way for ya'.