Beautiful gun.
Is the right stock panel numbered (possibly faintly, in pencil) to the gun? If so, you can find a replacement left panel, but perhaps not an exact match in color or grain. Pre-war Magnas will be pricey.
If you are interested, this one looks to be a good candidate for a factory historical letter, which will also confirm the type of stocks with which it shipped if yours are not numbered. I think the front sight is the Call or flat bead type (or the McGivern, I can keep the two straight in my head for about 15 seconds at a time)
. Enjoy!