Call Jason Barden of Pumpkin Mountain gunsmith's in upstate New York. He has all the "new" old stock, in the white original Fox parts.

https://www.ahfoxparts.com

Last time I talked to him he had a set of HE barrels in the white and also dozens of original semi inletted stock blanks. A good wood guy could join a new stock to the old one at a reasonable price without all the expense of all the inletting.

I bought a 16 gauge barrel as well as all the forend iron to make a custom two barrel set from Jason. He is a super nice guy.