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Source for 800x4 Tires

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I am changing my 600x6 tires with Cleveland Disk Brakes for the 800x4 tires with Grove Disk Brakes on my '46 J3. I have a complete set of wheels, but I am having bit of problem locating the 800x4 tires, new or used, can anybody steer me in the right direction to some one that might have a couple of tires?. Everybody I talk to says they are back ordered from Goodyear.
Thanks in advance,

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