i came across a brand new quattro tranny for "Audi Quattro, 100 series and coupe." am i wrong that the coupe has the same tranny as the 90q which has the same tranny as my 80q? the part number he gives is 1A-300-042H. can anybody verify as to whether this will fit on my 1990 80q? it is brand newn from VW, and the guy only wants $450. thanks in advance. -joe brown