Like new Hurst from 98 wouldn't work in my 99, suggestions?

[LSCobra]

I got a deal on a Hurst Billet shifter from a 98 Cobra with about 2k on it. I attempt to put it on my 99 last night. It should pop right on, but it doesn't; it's offset by about 3/4" to the right. I finally get it lined up and begin tightening the bolts. When done, the shifter is frozen, won't budge.
Before I go on, I put shifters in my two previous 5.0s, so I'm quite familiar with the drill.
I loosen the bolts, and it shifts, albeit roughly. I take it off two times and try again, racking my brain why this won't work once tightened down. I finally gave up and reinstalled the stock stick.
Any thoughts you all have would be appreciated before I call the guy back.

 

[99SVTAddict]

Different transmissions require different shifters.
The 99 has a T45...I'm not sure what 98 Cobra's came with. I want to say a T45 though.

No idea.

 

[LSCobra]

The 96-99s had the T-45. The 01 has the T3650.
Tremec made the T-45 under liscense from Borg-Warner starting in '99, but if that was the difference, everyone with a 99 would have problems installing a new shifter.

 

[VerbalKint]

The 1998's had a t45 as well.

 

[1999SVTVert]

Is the guy with the '98 positive that he actually has a T-45 in his car? Did you acquire your '99 used? Only thing I can think of is that one was switched out with something else.
I swapped my Steeda Tri-Ax from my 95 GT T-5 into my 99 Cobra T-45 with no problems at all, your situation sounds quite strange-