Try Potomac German Auto on the east coast, or Silver Star Recyclers on the west coast. Both should have a good 603 pump. I suspect your mechanic is wrong, but I guess we'll find out when you get a different pump installed. A new/rebuild is about $750 from Gus at Pacifc Coast diesel injection, so I wouldn't want to pay much over $250-$350 for an unknown used one. If you get a used one, replace ALL the external seals (bottom, side, both rear, vac shutoff pod & O-ring, etc etc) before installing it!!!!
