The 238 is similar to the 258. For parts, try gunpartscorp.com
You might find what you need at firstname.lastname@example.org .
Numrich has a gun parts website. Best bet for any gun parts or schematics...
the value of a 1948 Stevens double barrel shotgun 16 gauge. Hammerless.
Try Numrich Arms (www.e-gunparts.com). Look for parts for a Stevens 311 shotgun. They should be the same.
it is a Stevens, parts are interchangeable...
Have you tried e-gunparts.com?
It's a pretty common gun, so any gunsmith should have a source for parts.
I would check at Numrich Gun parts corp.They may be found on the web.