The following are DPDT on/on/on switches that our schematic was designed to work with.

Allparts:
713-391-0637 (Texas store) www.allparts.com
- EP-080 - DPDT on/on/on chrome
- EP-079 - DPDP on/on/on black
- EP-129 - DPDT on/on/on gold

Newark Electronics:
805-449-1480 (Ventura Office)
- 81F961 - C&K T211SHZQE DPDT on/on/on chrome
(Other brands are likely to be available from this source as well.)

Alcoswitch:
Distributor: Cal Switch 213-770-2330
- MTA-206PA - DPDT on/on/on chrome

Gotoh (Japan):
011-81-33-862-1641 or
Moridaira Musical Instruments (Distributor) 011-81-33-864-7454
- MS500 XFB - DPDT on/on/on black