Done exactly what your talking about doing this past winter, prior to turkey season, to my SBE. I sent mine to Rob Roberts to have him drill/tap my receiver. he does work for Benelli and I figured that he would have the most experience with Benelli's. While he had it I had him do a trigger job on it also, just sent him my SBE2 Steady Grip for a trigger job because I was impressed with the outcome of the SBE's trigger. Anyway, I also purchased a 336 base that I sent along with gun so he could match the screw pattern. The 336 base is the lowest option you have other than the Speed Bead mount which I do not think will work with the SBE, but I could be wrong. You will also want the protector, which is a protective addition that will keep your lens and sight from getting damaged. Will only raise it a 1/16" or so. I also added a stick on God O Grip shotgun wedge to raise my eye just a little and help prevent cheek slap. Really didn't have to add it but it does seem a little more comfortable. Made an awesome turkey slaying machine that I don't think can be improved on. JMO.
Ridge Rooster