i have this but its old and half broke. wanna get one now before its too late.
You push in on the button to get it into neutral, its on the shifter of my 91 Sunbird omc 4.3L
I would think you have to look for a used unit and take it off of that. But the used one might be in better shape than yours and you could just switch units out. I have a 86 omc and mine was bad found a brand new one on e-bay n.o.s.