ATM is not the "trade mark" for Trumpeter tracks and Trumpeter is the distributor of ATM products in China. Please don't get confused. For those who are interested to our products and news pleae visit our site at www.armourtrack.com for more information.
So far, these ATM tracks are hard to find in the U.S.A. I recently got the two sets for the M-24 Chafee (Early & Late).
Both came with a beautiful set of resin drive sprockets and idler wheels. The M-24 idlers can' be easy to duplicate in resin; they have a series of open rectangular holes on the inside face, and these also looked great.
The box art shows the sprockets and idler wheels. So maybe if you DON'T see them on the box, they aren't included.
I had no idea these were made by TRUMPETER. Thanks for the information!