Just as a footnote , as others have mentioned I would be wary of rubber boots when transmissions kick out of gear occassionally. Mine was rebuilt by Keith Craft and received a number of replacement internals in the process, but I've had it kick out of third a couple of times randomly. Could still be something weak in the transmission but I'm not convinced of it yet. I've noticed that when I put the stick in third gear the rubber boot pulls back on it quite a bit. I measured it and pushing it solidly into 3rd and releasing it, the shifter ball rebounds a good 1/2 inch from the boot tension alone. It doesn't matter if I pull the boot up or push it down. Then I removed the ring and boot and tried it and it rebounds not more than 1/8 inch on it's own.
Having read somewhere that the Sunbeam Tiger boot sold by Sunbeam Specialties, Inc is substantially thinner and more flexible than the usual rubber boot, I've called them up and ordered one. I'll post back after I receive it and give it a try. He said they have supplied quite a few of them to Kirkham for their cars so I figure that speaks highly of them. We will see.