As others have said, most any FD that works on a triple should work. I'd stay away from modern triple derailleurs- as they're kind of meant for indexed systems with specific sized chainrings.
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*Recipient of the 2006 Time Magazine "Person Of The Year" Award*
Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.