I'd look for some close up pics of the 43 and see if they match up; maybe someone on the forum has one and could post some? How badly broken is the stock? If it's not splintered, or not missing chunks /fragments, it's not too hard to glue and refinish yourself. What parts are needing replacement? If they are just rusty, but functional, I'd refinish the gun, and leave it as is.
Here's another GB link to compare your rifle to: