The hole and retaining ring on mine is square or rectangle and I haven't seen a boot in the normal catalogues. I'm thinking I'll have to use a transfer case boot or newer big truck shifter boot. 1957 Chevy 5700 with SM420
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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