Here's my measurements of a 55.2 spare tire carrier's mounting bolts.
9/16"-18 - 8.25" long
1/2"-13- 6.75" long (or so) with a lug nut.

Pictures of the carrier. I know this is not your specified year range, but if you hold/clamp your tire carrier up & run a dowel through the holes, you should be able to get a measurement for what you need.

Brad

Wrench Fetcher, PhD