I have 3:55's, 16" tires, and I use the white (23) and it is pretty much right. Mine was chewed up too when I replaced it. The old one was in there for about 8 years. It is really easy to change, but you do have to pull kind of hard to get it out.
Check this place out:
http://www.50resto.com/
In search type in Speedometer gear.
Brad
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1991 Mustang GT Conv.
K&N air filter, Cobra manifold, 65mm TB,
Adjustable fuel pressure regulator, 180 thermo., Mac headers,
High flow H-pipe, Force II W/2 chamber Flowmaster,
Hurst Shifter, 3.55 gears, subframes
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