auto's wern't an option on earlies they only came on t4 engined vans, you may find one on a crossover if it has a t4 engine but it will be the vacumn 003 box and your 77 would have an 010.
Some wonderful guy had one and it is now in my hall pissing oil everywhere... which is actually a good thing!! Now all I need is a manifold to suit if anyone has one?? Luv XCX