suprashep

Hi all, last year I had a gearbox fitted (in the very loose sense of the word), lost my job soon after and ended up taking the car off the road. Only when it was way too late, like a couple of months ago, did I find out it hadn't even been bolted together properly and was bone dry. Now it seems like I'm going to have to yet again replace the gearbox. As I am really struggling to find a box at the moment, I was wondering if there was another box from another model that would be a match with mine?
Many thanks in advance
Shaun