Thanks a lot! Time is not the problem ;)

Hi Gerry . . . Devin and I have access to some used examples, by these are age hardened and likely have shrunk in size ... so, the measurements will not be very actuate.

The good news is, I just ordered an original Yamaha nos air boot, but it will probably be about a week before I receive it and am able to give you the correct measurements . . . if you can wait.