I picked up some reproduction Milk Cans on Ebay for my 366321 Milk Car that have the plastic Body with a metal base. When I first got them they jammed alot in the feed chute. Looking closely, I noticed they all had a little sprue spur on the top of them that, when filed down, fixed the problem and now they work just fine. These were the non-magnetic Milk Cans for the Scale Milk Car.