What year is your GT ?
A 5 bolt 4" circle does approximate to 5 bolt 100mm. Meaning that it will most likely fit. That wheel and rim looks like a mopar FWD 5 bolt 100mm donut spare. I'd say thats better than nothing in a pinch, or a rim n tire that doesnt fit. Matter of fact i remember seeing a set of small bolt pattern rallyes on a dodge neon one time. 5 bolt 100mm circle. Guy told me they were a direct bolt on.
I will be running 15s and 225 60 R 15s on the rear of mine, and i also upgraded to a 5 bolt 4&1/2" circle. I will be using a donut spare out of a mustang GT in my spare tire well.
