Other than a grind to fit, I'm not sure there is a direct bolt on although a slip on should fit. I think those slip on pads are like a duct tape and crescent wrench solution and not as permanent as I prefer.
On my 1200 I replaced the wooden stock with a Hogue 12" which has their Airsoft pad. I don't think it's as good as a Limbsaver and I've written Limbsaver about it but alas, my email was ignored. The Hogue is fine and definitely helps with felt recoil so it will be an improvement over the factory one.
Hogue also makes a regular LOP stock and Speedfeed uses the Supercell pad which is supposedly the functional equivalent to the Limbsaver.
"Of every 100 men that go to battle 70 should not even be there, 20 are nothing but targets, 9 are true soldiers, and we are lucky to have them for they the battle make but ONE, one is a warrior, and HE will bring the others home." Hericlitus