Funny story came to mind. A friend bought an AyA SxS as a knockabout and lender gun for guests, quail hunting in the briars and tall grass. He got it cheap, because it had been drastically cut down to about 12 inches. We knew a gunsmith who liked to restore all guns, refinish stocks, and took it to him.
He saved everything, and said, "I have a piece cut off a stock which might fit." So he went to a drawer full of plastic bags of pieces of wood, forends he had duplicated, etc, and pulled out this piece of wood.
It fit perfectly. It was the piece off that shotgun, which he had shortened for a boy, 20 years before. What luck. He glued it back on, sanded the stock to blend in the joint, refinished it, and it is shooting fine here 12 years later.
Until decide what swivel stud to put on the butt of my combination gun, I may put on one of these leather pads with little padding, like the Kick-Killer ( only 1/2 inch added ), and add a swivel loop to it for a sling. It already has a swivel on the barrel.