Back in the late '90s, about '98, maybe '99 reading the rules it said that the mustangs could use a 10" wide rim, and my AMX was limited to a 9", maybe 8" I forget and don't have the rules anywhere close, and I looked for them a few minutes ago. Now do you think a '69 AMX stock can hold with an '90s mustang stock? ya RIGHT. I was also told by those in the know that lots of the rules for that class were made up by the cobra owners, so of course they made sure THEY had the rules advantage.