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this link is to a map that I think has lettuce as a crop. Download his map file and extract the lettuce harvester.
I don't know if he includes a seeder or not. If not you can easily add it to any modded seeder/planter.
Edit the xml and look for crop types and add lettuce to it.
You should see 2 areas - 1 is for the store data and 2nd for the machine itself.
If you don't know how to do it - send me for planter in here and I will add lettuce to it. map with lettuce link