Join Date: Nov 1999
Location: Where the Navy sends me...
If they're OEM, then they're not 17x7", they're 17x8". And no Mustang has ever had a 5x100 bolt pattern. They're 5x4.5" (aka 5x114.3), like every 5-lug Mustang.
You might want to post pictures of all 4 wheels.
'89 GT convertible, N/A 357W, MM front susp w/425# coil-overs and Koni D/As, MM TA/PB rear setup (Koni Yellows, 390-430# springs), Stoptech 332mm / 12" Baers, MM 6 point rollbar, Maier 1.5" flared fenders & quarters, 18x9.5" front/18x10.5" rear Enkei RPF-1s (street), 18x10" CCW C-10s (track), etc...