This is the one I use on several of my rifles to get proper sight picture due to my high cheek bones and low combs of most traditional hunting rifles. I just put padding of some sort underneath this and strap it on and get a cheek weld with my eyes closed. If I have to go up or down to get full sight picture when I open my eyes I adjust the padding level as needed. Seems to work very well for me and the little zippered pocket is pretty handy as well for a couple extra rounds (I wouldn't trust the silly ones on the outside of the pocket) and a lens cleaner and lighter as well. Likely not the best one out there no doubt but for $11 shipped (Amazon just raised the price to a whopping $15 shipped now) it seems to work well for me.
https://www.amazon.com/Allen-Buttst...tstock+Shell+Holder+and+Pouch+for+Rifles
