What would be a fair price you give me for it? It'll take me a little while to disassemble the countershaft (at least a week until I can get to it), as I was planning on just selling the lot of the stuff all at once.
You have to pull the whole tranny to get at the gearsets - especially on D-series. The interlock bolt is inside the bell-housing. I wouldn't want to imagine chanigng gearsets with the tranny still in the car.
I'm not 100% sure these will work in a 4th gen tranny.