LGB Containers--which flat car to use?

[toytrains25]

I have a set of 2 LGB containers: P&O and LGB. The part number on the box is 5057.

I would like to know the specific flat car(s) that these containers are supposed to fit on. A part number would be most helpful.

I have some Bachmann flat cars, but they are too long.

Can anyone help?

[tworail]

Hmm, I have the models of those containers in the basement somewhere. Let me dig them up and see what is stamped on the bottom.