it's a direct bolt-on. just use it.
Oh, you don't need to re-install the little spring that pulls your shifter back towards center though. The MY99 trannies don't need it.
That said, if I could have that spring since you don't need it, I'd appreciate it.
I just moved to a turbo tranny and I need that spring - my shifter just flops to one side and doesn't want to stand up anymore.