I also did the simular mounting by using 1/4" bolt 4" long cutting it in three so each bolt is abound 1 1/4" long. Usuing a acorn nut, I wrenched in so it stuck out enough to put a regular nut and washer to hold registration plate on tight. I cover the extender bolt with the acorn nut and snugged it to the regular nut lightly tightened so it looked nice and clean. When I put the display plate on, I just take off the acorn nut, mount the plate on the bolt and snugg up the acorn nut. It looks good from a short distance. Just a added thought for quick mounting display plates.
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