Good point by Twister, That Deer Slayer is a sweet trigger.
The deal is you should try that one or a double trigger from an Investarms, Lyman, Cabelas model as well as the TG from the same models.
They are all nearly 1/2" wide like the trigger you have.
A single set trigger will be hard to find for that wide an existing mortise, and unless your use too a single set, they have a funny "bounce" when they're used that takes some getting adjusted too.