The T-5 shifter has a 3/8x16 threaded end. So yes it would work.
As for yours it sounds like you have the metal core of the stock knob still on your shifter. try putting a pipe wrench to the knurled part and try removing it.
1981 Jeep CJ7 4.0 HO, AX-15, D300, D30, D44, SOA
1977 Chevrolet C/10 step side 454 TH400 3.73 posi