I have tried finding one
And to the best of my knowledge it did not have a boot
I made one with old tire tubes and copper staples to keep mice out, I had a clutch go bad from eating up a mouse nest
Disassembly and cleaning fixed the clutch and that’s when I looked high and low for a boot and came up empty handed
Hopefully someone can suggest a stock boot that is easily modified for our old AD trucks
-s