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These guys (www.vibroworld.com) have a quad can (made for Gibson GA-20 amps) with the needed specs, but it is .75" too tall to fit under the ST-35 cage. They make custom cans, so I've requested information about a shorter version of the same thing, plus the possibility of getting some "enhanced" versions made with 600v instead of 475, for longer life. Maybe if I can get a quantity made at a good price I could sell these, since they're so hard to come by. Or I may have just given away the store by requesting it from these guys. Oh, well.