Like Jerry said, may need some heat, even a propane or map gas torch might be enough to expand the shank and break the rust bond. I had to heat three or four of them but I have oxy-acetylene so I hope you have good luck with them. And yes, left hand threads on the left side of the truck.
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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