Yup, the T-Bird takes the same goofy M12 x 1.75 thread as the Mustangs. If you want a stock looking leather knob for a reasonable price, check with your dealer on a 94 - 98 Mustang SVT Cobra piece, I think the number is F4ZZ 7213 C, don't recall for sure. They are slightly smaller than the SC knob, but the price is alot smaller, should be about $30 U.S. or maybe cheaper.
cheers
Ed Nicholson
SCCoO