Here you go,
http://www.mpbrakes.com/products/product-detail.cfm?product_id=441

The '41-'46 gear box is a big improvement, but don't expect power steering feel from it. At a stop, you still have to man handle it, but a slow speed turn is much easier. The steering wheels are a little different offset on the 41-46 so I cut the column shaft off a old '37 and replaced the top half of the '41 so I could keep the '37 wheel and horn switch.

Joe