There's a thread on doing it the right way here:
http://986forum.com/forums/showthread.php?t=4961
I took the lazy way out and used split boots. I did one and only later inspected the others and found the other three were also split so I did them as well. The only problem I had was that the best match for boot size I could find was too big and I had take up the gap with silicone tape.