I would really go with what NoShoes says. He knows his shit. I am using a hybrid 3sgte in my MK1.5 and the All-Trac is using the first gen 1988 3sgte. So that is my experiance with the 3sgte. Brian is the man to listen too.
Look at www.jarcoinc.com to supply your clip. Tell them I sent you and you should get a better deal.