Beanman;
You are in luck, Call Gun Parts Corp. located in West Hurley, New york. Phone number is (914) 679-2417. In their Edition 21 catalog, they have butt plates avertised for the older L.C. Smiths in 12, 16, & 20 gauge. Give them a call and tell them what you are looking for and they will send to you if they have the item. They may need information from the gun, make, caliber, serial number in order to insure they have the right part. They listed the butt plates at $12.95, but the catalog is 1-2 years old. Their catalog is worth the few bucks that it cost, I use it all the time when looking for obsolete gun parts.
RELH