I think I've found it!!!

I've spent ages now, trying to figure out how to build the wishbones. And it looks like I've finally found all the necessary elements.

The top track rod end will now be from a BMW, or to be precise an E34 BMW 5 series track rod end. These have an M14 x 1.5 thread, so I'll need to get inserts to match. But at least they're not £10 each! 

Anyway, now that has been sorted, I can finish stripping the donor. I'm nearly down to removing the shell, then I can wheel the base into the garage and get my drive back!