Brownells has a few. I have never used any of them as I don't do any shooting where I would need one but I'll list them for you.

Graco makes a fairly simple one that allows a maximim of 1 1/8 inch LOP adjustment and can be rotated to adjust for offset. It runs about $60.00. Part number... 352-150-101

Speedlock has a fully adjustable plate that allows 1 3/4 LOP adjustment, 3/4 DOH, +3 inch height at comb, and 180 degree rotation. $145.00 Part number... 840-500-001

Then you can get into the adjustable pads with the recoil reducers installed thatwill run you $165 on up. (Oops I added a hundred bucks there.[8D] Sorry.)


You may be able to find them cheaper at another place but here's a start.