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I had looked and looked at all the local hardware stores, I found lots of 8 and 10 inch bolts.. but none are grade 8.. vbp has kits, so you might have to go that route....
Hi 76Y,
Many towns have a commercial fastener company like FASTENAL. They have or can quickly get a good supply of grade 8 bolts.
Regards,
Alan
PS: You do need to be careful that the bolt doesn't get too long. The longer bolts allow the outer tip of the long spring leaf to get very close to the inside lip of the wheel.