I don't have your model but they may have used carriage bolts, the bolt may have a square shank that will keep it from turning. I would soak them well with penetrant, use heat on the square nut if it won't damage anything. You want to make sure that the nut is going to come loose and not spin the square shank.
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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