This is a little bit of a problem, as even the Alfa a/c belt is difficult to fit on, and the readily available ones from the regular auto parts stores are either too loose or too tight. Part of the problem is that the Alfa belt is slightly narrower than the auto parts store version, thus the store bought belt doesn't fit down further into the vee of the pulleys. The other problem is that the idler doesn't have enough travel to properly take up the slack of any longer belt.
I think I used the closest but longer store bought belt, removed the idler, installed the belt, and then reinstalled the idler, ending up with the idler moved all the way, and a slightly loose belt. Works ok though. Don't use a/c much here in Seattle.
Some use the Alfa belt, sort of start it on the pulleys and then rotate the crank to force the belt onto the pulley crank. I didn't do this because I was worried about harming the belt. They don't stretch worth a darn, lol.
I think the alternator belt is the same situation, a pain to put a new one on. Haven't done that yet, but at 100k miles, should soon, has a couple of small cracks. I suppose I will try the Alfa supplied belt and force it on via turning the crank because the alt doesn't have enough swing for much adjustment. You have to cut the old one off.
1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27
previously owned since 1964:
62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
Last edited by Del; 01-20-2017 at 06:33 PM.