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Central Arms Company was a trade name used by the W.H. Davenport Firearms Company on shotguns made for the Shapleigh Hardware Company of St. Louis. MO.
try google, dogpile, mamma, or any other search engine. it might take a while but... eventually you'll find something helpful.
Both 'King Nitro' and 'Central Arms Co' are trademarks of the Shapleigh Hardware Co, which was a major catalog retailer from the late 1800's well into the 20th century. The shotguns marketed under that name were made for Shapleigh by different companies, notably Davenport Firearms, Crescent, Hopkins & Allen, and Stevens. We'd have to see the shotgun to determine which manufacturer actually made the shotgun. www.countrygunsmith.net
Try your local gunsmith. The Riverside is a Stevens shotgun. If you can find out which model it is, you can probably find the wood at Numrich Gunparts
Auction sites, Shotgun News, gun shows, gun shops
Try Numrich Arms
it is a Stevens, parts are interchangeable...