Rat-30, you might want to check out the Limbsaver slip-on pads - see
here for details. While you're there, go to their home page and check out their other models. They don't list anything for Speedfeed stocks, but if you measure the recoil pad, perhaps one of their other models (particularly the "grind-to-fit" units) might be usable.
As for the Kick-Eez models, the same applies - find one that is close to what you want, and then grind to fit.
Hsmith, I agree that the Limbsaver does a good job: but for me, it has the MAJOR complication that those air chambers keep the shotgun "bouncing" instead of letting me get right back on target for a second shot. I notice that Kick-Eez has recently updated their
comparison page to reflect tests of their product against Limbsaver, Pachmayr, etc., and still make the claim that their product is superior in kinetic energy absorbtion. I see where they're coming from on this one: their pad DOES seem to "come to rest" after recoil significantly faster than the Limbsaver, allowing one a faster second shot. However, the Limbsaver's "springy bounce" also makes felt recoil seem a bit softer... You pays your money and you takes your choice, I guess!
I tested an early-production Limbsaver, and wasn't too impressed by the "Sproinnngg!" effect. However, I'm informed that their current production models are significantly improved. I guess I'm going to have to buy a current-production Limbsaver, and a current-production Kick-Eez, and fit both to identical 870's and shoot them, to see which one "feels" better from my (admittedly subjective) point of view. I'll post results here, and we'll see how they do.