Looks like your rifle is a Marlin Model 81 made for Sears. And, while not too local- here's a list of all your goodies including #403610B.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.