Hi, I confirm that I am now using the poly-v pulleys off the latest 3 cylinder Volvo on my old MD2030 (crankshaft and water pump). They fit as a straight swap for the old pulleys. The 90 amp Prestolite alternator I bought came with the usual v belt pulley but I changed that for a pulley off a scrap alternator. The original Volvo alternator can also be run with a poly-v pulley too again with a scrap pulley. There is almost no belt wear at all. I can give details of my supplier if you want. I hope this helps, Steve.