My '57 5700 LCF is the same cab as yours, the original seat is also a little too close to the wheel for me and I'm not big, If you are not too concerned about originality then maybe a bucket seat would be more adjustable.
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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