[Bob Carriere]

Some early Chevrolet Gun Tractors....Also knows as CGT had the specail heavy duty casted from axle which differed from the typical CMP later production front axle. ..... and from my experience and photos ...that special Heavy Duty cast axle had similar eggcups mountings and brake plate of a 16 inch CMP front axle.....
.....................even when 20 inch rims were installed.

Early cab 11 CGT had that front axle one is at the Kars Museum.... I also found such a large axle on a 1942 C15a ....... but it is the 4 bolt eggcup which would not exchange for the larger C60 axle......

Now to complicate things early FAT also known as Ford Artilery Tractors also had GM front axles.......

So my advice is save all you can from the C60 if they do not fit they can always be traded for other parts later...... once you have you gun tractor home start taking pictures of your front axle so we can identify it for you on the forum.

Photos 1,2,3 are from the Kars cab 11 CGT photo 4 is the same CGT with rare early cast GM rear axle
Photo 5 is Petrolia's famous Ford FAT with GM axle.