One chart on the web shows the bolt pattern has not changed for many years, your 2001 should be 8x6.5. I have mounted single shallow wheels on a dually rear in an emergency and the bolt pattern was the same from the 1984 single to the 2000 dually. My 1976 K20 had 16.5" bias ply tubeless. my 1984 C20 had 16" radial tubeless, my 2000 K3500 had 16" tubeless. my 2011 2500HD has 17", all are 8 lug. You should have many options when searching for wheels, if we were closer neighbors, I would give you some of my excess wheels.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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