I have the 336 mount on my SBE Benelli Steady Grip. It felt like I had to slightly raise my head, since I was a bead shooter for years I always plant my cheek hard against the stock, but it really wasn't bad. After noticing a post from another member here where he shared a picture of his gun and a raised cheek piece that looked pretty nice, I contacted him and found out where he got it. It came from a company called "God O Grip" that make a veriety of stick on pads for different guns. The model I bought was called the shotgun wedge, and gives you approx. 1/2" rise which made my cheek weld feel a little more familiar and centered my eye up perfect with my FFIII. Mounts on gun using 3M adhesive tape that is very secure. I would post you a pic, but I don't know how to put it on here. If you are interested PM me and I will send you a picture by text. You can also google the company name and see their products.
Good Luck
Ridge Rooster