I talked to Billy via email. Here's the run down on his east and west coast kits he's using:
Hi Don:
The configuration is 14", 13", 8", 13",& 10". The drum set is a PHX that was ordered about 4 years ago and showed up just last October in LA. I now will keep it in the USA at Evans, in New York for all dates east of the Mississippi River and use the white set for the western dates.