In also trying to research some information I went to Cornell Publications (
http://www.cornellpubs.com/old-guns/item_desc.php?item_id=930 ) where there are many old catalog in re-print. In particular was Schoverling, Daly & Gales 1892 Firearms and Sport Goods Catalog. This is a 116 page reprint and on the right column going down to Gun Parts For; there is a listing of different guns. Whether there is any butt plates or where they come from is unknown unless you have a copy.
1912 catalog way down on right column has recoil pads, again don't know if any description. Catalog is 265 pages.