MB, Lewis model Ithacas ended production in 1906, your best bet is to buy the action on Ebay or have yours repaired. This model was only made for 3 or 4 years so parts are going to be in short supply. The plate I have is for a Lefever Nitro Special which was made by Ithaca in the 20s and 30s, it won't work on your gun. Good Luck, I think I would have the trigger plate welded by a competent party and use it.

I learn something every day, and a lot of times it's that what I learned the day before was wrong