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Pimpston,

FYI, you can make a 6 lug 17.5 wheel from two more common wheels.
Use the 8 lug 17.5 wheel for the band part, and a 6 lug 16.5 wheel for the center. The 6 lug 17.5 wheel uses the same center as used on the 6 lug 16.5 wheels. This knowledge is from another very knowledgeable member.

Believe the 6 lug 17.5 wheels are very rare from my searching for them also. I am putting a set on our 64’ K10 Truck.
From my searching the 8 lug 19.5 wheel is more common, yet still hard to find.

Les