Perhaps Mr. Dudley has the parts to do the job. If not the Miller Trigger boys (Classic Gun Stocks) can do it BUT you may not like the price.
I was misunderstanding the question too.
If you want to convert from DT to ST, then yes, Miller is the way to go, but not the cheapest. And finding the parts just laying around somewhere for the Ithaca Lefever single triggers would be a difficult task. You would be better off buying a LNS or Western arms gun that has one and in rough shape and using it for the parts.
