They are Mickey Thompson ET Street Radials, 325/50/15's.
I removed the bump stop to the side of the frame and re-positioned the bump stop on the axle housing with a relocation plate to make everything work. Here are a few pictures:
OEM bump stop on frame.
Cleaned off the undercoating to...
Can't speak to the front as I have 14" brakes, so I used 17" rims. On the rear you need to trim the sway bar mount as pictured here, then it is no problem installing 15" rims.
From this:
Trimmed to this:
Add Sway Bar relocation plates like this:
Then 15" rims fit the rear like this:
Steve, nothing complicated about the install as it is just like changing springs. I often find it seems like it takes longer to get my car up on jack stands than it actually takes to complete most mods (lowered with BMR K-Member). Once you have the struts and springs out it is basically swapping...
Limited-edition 2008 Ford Mustang GT California Special assembled at Auto Alliance International on 05/05/2008. This vehicle is #4,688 of a build of 4,918 coupes and is 1,215 of 1,278 manufactured in