OK, hate to rain on the parade, but.....
I was thinking of putting a new pad on my 1894. I called Marlin to see if all 1894 models use the same butt-stock because some come with rubber butt plates, some with rubber recoil pads, and some with plastic butt plates. The CSR at Marlin confirmed that all the 1894's use the same stock, but none of the pads are precut. They're all installed on the stock and then sanded, just like any local gunsmith would do. So, my idea of getting one already formed won't work. The only option would be to see if a used one may be available that's already mounted and fit to the stock. As far as my rifle is concerned, I can either try one of the prefit ones from Pachmayr, or sand my own down after mounting it.
Sorry to be the bearer of bad news.