Not sure what you have, but down here a 51 Chevy big truck has 5 lug front hubs and 10 lug rears, same wheels front and rear, all on 7.25" bolt circle.
But down here the largest 51 Chevy is only a 2 ton...
Don't know what bolt pattern a 51 Chevy "3 ton" in Canada has?

I have sent my email to you so you can pass along a picture.

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
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-