The Stovebolt Site Forums The Shop Area Engine Shop Engine Number 41 1/2 ton Truck

There are a lot of models of W1's. I do not know off the top of my head which one a 41 used, but they are not that scarce. Here's an ebay example
In checking I see 1941-42 used a mod #483 Part #839500
If you are not going for judging there are a number of models that will work.