Look on Ebay for a used Ultegra triple FD and run that. Either get one with an integrated clamp or get a "braze-on" style model and a separate clamp to fit your seat tube.
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You've mentioned using your left front STI Shimano 105 shifter to shift a triple crankset. It shifts a compact double crankset now. I'm not so sure Shimano STI can shift both double and triple. Shimano makes unique double and triple STI shifters in Ultegra and 105 models. So I'm questioning whether your crankset change will be as smooth as you are implying. I think you will need a new left STI shifter for the triple crankset.
He probably meant "Make sure your FD is from a road group" in order to work with the OP's STI levers.Ah! You just totally dashed my hopes that someone makes a high-capacity road derailleur. You totally saved me hours of poring over Google searches.
I knew about the front derailleur compatibility issue, but the sentence order made me think that there was some other issue with rear derailleurs.