Try Numrich Gunparts for a breakdown and parts list.
Should be the same as Winchester 1400 shotgun. Email me for a copy of the manual.
It depends on which model you have. The best way to find it is too check the owner's manual.
Contact Winchester Customer Service through their website.
You need a manual. Contact Winchester or find a gunsmith and ask for help.
It is important to have a manual items bought. Manuals can be found online on Winchester forum websites or general firearm forums.
A Sears Mod 53 is a Winchester Mod 70. If Sears doesn't have an owner's manual for the 53 (and you can't find one on eBay), go here http://www.stevespages.com/page7b.htm for a Winchester manual.
If you don't have the owner's manual, find a gunsmith and ask for help
See related links below
Try the auction sites.
DON'T!!! unless you absolutely have to. you can cause damage if you don't know what you are doing. and parts are hard to find.
No known web site.
download from Winchester home page, will be listed under manuals category.