I had an LS one ( sporty twin headlamp model ) back in the day, rhd local car too .
Couldn't get anyone to buy it off me so she went to the scrap , still have the big side draught Solex off it somewhere .
Unless there's one hidden off in a shed somewhere you won't find a good one.
While your speaking of Audis I know wheres there's an Early 80
It wasn't so much a replacement. It came about after VW took over Audi and NSU they had a few of these lying around the floor