Where can I get a new uncheckerd stock for my older 39A? ('75) I broke the old one when young and the one Marlin sent me neither fits well or matches the forend.

I'd try Marlin first then check with these folks.

http://www.e-gunparts.com/dept.asp

First things first the buttstocks from a 336 will fit, here is what they have in plain walnut buttstock. I bought one of these for my 336RC in .35 and it is as good as it looks.

http://www.e-gunparts.com/DisplayAd.asp?chrProductSKU=406240A&chrSuperSKU=406240&MC=