Above is what a factory knob from an SVO looks like. The SVO version had the
Hurst logo stamped into the leather.
What your Saleen probably cam with is the Ford Motorsport version of this knob. This one looks just like the above knob, but has the Ford Motorsport logo stamped into it (Instead of the Hurst logo) and was sold in the Motorsport and SPP catalog. Saleen listed the Motorsport version as the "Anatomic Shift Knob."
The SVO used a different size thread (or pitch) on the shift lever than the standard Mustang. So... cross threading take place when either version is forced onto the other.
Oh… and keep in mind there is currently a Chinese version of the Ford Motorsport knob on the market and offered by the Mustang parts houses and maybe even FRPP. This one features a Ford oval stamp instead of the Motorsport logo. It’s also made of a harder, more granular leather (or even vinyl).