The Sears Model #41 was made by Marlin Firearms and was a duplicate of their M# 101. This model was discontinued by Marlin in the late 1970's. You might try your local gun shop as a starting point.
The 282 is the Winchester model 521 made for sears
find a collector i sold my sears and roebuck for 750 im sure you can get quite a bit.
http://www.histandard.info/PDF/Sears%20Shotguns.pdf
Try Numrichgunparts.com
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.
1971-72 model
www.e-gunparts.com
We have them. gunshop@nctv.com
the model number is #57158762 and serial number is 7621447
The sears model 6c-22 was made Winchester/ same as Winchester model#490
That is basically a Savage Model 94 as made for Sears. Stocks are widely available from internet sources.
One place to check for a magazine for an older model .22 rifle is at a pawn shop that trades guns. Another would be neighborhood yard sales.