Pawn shops and gunshops. Look for the J C Higgins brand name as well as the Sears name.
I need butt end of a duble barrowl shotgun 1017 sears.
You will need to find out who made it first.
www.e-gunparts.com
http://www.histandard.info/PDF/Sears%20Shotguns.pdf
you can find them in the numrich catalog or there web site e-GunParts.com
You might check your local library for old catalogs.
The sears model 200 is a Winchester 1200. That will make it easier to find info. I have one of these, with adjustable choke and vent rib. It is a sweet shooting and smooth little shotgun.
Your 12 g pump shotgun was made for Sears by the High Standard Company- it was their Flite King model shotgun.
That should be a Savage/Springfield Model 18. If you can't find parts from a local gunsmith, try http://www.e-gunparts.com i have a sears roebuck bolt action .410 shotgun model 110.1120 3''. i need the shell ejector piece. to get a clip for a shotgun try marlinguns.com.
I have one for sale. Message me @ garym6@cox.net
This should be a Savage 18-D.
J.C. Higgins is an old brand name used by Sears.