Are the boxes in R31 Pintara's 71c's or 71b's. In the last few days I've decided to use SR20 I've got in my Sunny sedan,instead of an L20B. If the Pintara boxes are the 71c's, this should be an easy source of a gearbox. I can remember seeing a manual Pintara a few years ago in a wreckers & the shift position was at the front of the oval in the transmission tunnel. Maybe I wont have to cut too much in the Sunny. If it works, then I'd probably wouldn't have much use for the old box, so I'd wouldn't want too much. I might even be interested in a straight swap, though I'd have to find out how much they want for the Pintara box, as I might be ripping you off.
I was going to try to call some drift workshops to see if I could find a bellhousing, I ask how much the boxes are worth at the same time.