I just stumbled on to this site...doesn´t seem very active and I don´t know if you solved your problem, but I too struggled with this issue for my 77. I wanted a 4 into 2, not a modern 4 into 1. The best site for info I found was vimc.com which is run out of your part of the world. I think there are two suppliers listed there...the one name I remembet is MAC and I think they sell on EBay. They have a 4 into 2 though the ends are cut back at an angle rather than being straight as the stock ones are. Pretty close though. Another option though I didn´t want to get into it was to just change the baffles and rechrome the outer pipes. It means drilling out the spot welds which hold the baffles in but you could get a shop to do that if you can´t. I was able to use rust remover and chrome polish and while they don´t look new I wasn´t after that anyway and am happy with a little