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Should be able fo find something workable at a local autoparts store, I know Wal-Mart carries frames screws and some mounts, but I don't know how well those would work on a MINI
Plate carrier from MINI dealer Part Number 51-18-0-141-089 $20.88, just bought one. This is the part that attaches to the boot with two screws. The plate and any plate frame attaches to the carrier with 4 metric screws. Be sure to get the right length. Don't want to poke through the felt backing that is between the carrier and the body.