Here you go:
http://www.stovebolt.com/techtips/wheels/

Yes, you will need to make bushings to adapt the newer wheels (with 5.25" center hole) to your 41 truck with a 4.something center hole.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-