sure you're not thinking of a citroen?
I've seen a very rare left hooker factory turbo with roll cage, also the rally MK1, (have the build instructions for one

) But not one with height adjutable suspension, I think Citroen patened that with their hydropnumatic (yes I know my spelling is sh!te) and Rolls Royce paid to use it on their cars. I have been a bit of a geek when it comes to MK1's, but the man that knows everything there is to know about VW's of this age is rubjonny, and if he hasn't replied...
Cheers,
happy hunting
kraM