I was in the same boat, mine had no boot or seal when I acquired it. I researched available boots and bought a square one from Summit Racing, along with a boot for the park brake lever that was designed for a transfer case shifter.

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