Try eBay, most of the copies are reproductions but they'll have all the info.
Contact Winchester Customer Service through their website.
No known web site.
Winchester made the model 1873 rifle and the model 1876 rifle,but did not make a model 1875 rifle.
what type of scope mounts do I need
The Sears 2C was made by Winchester and is basically the same as the Winchester Model 131. Owners manuals might be found online at one of the auction site like eBay or GunBroker. We have parts available. sales@countrygunsmith.net
A Winchester Model 70 is a rifle.
rear site is it possible ot get one and how does it come of the rifle
Follow this link to contact Winchester, and request a manual: http://www.winchesterguns.com/customerservice/ownersmanuals/index.asp
Your winchester model 1890 .22cal rifle was made by winchester in 1902.
what is the value of a Winchester rifle 85?
This model was made for Sears by Crosman. It is a Crosman model 160. For the owners manual see the link below.
Your winchester model 1892 rifle was made by winchester in 1923.