I was wondering what i could use to replace the crappy plastic sights that came with my traditions kit. For the front the lyman sight for the .360 dovetail should fit but what about the rear sight? The barrel is one with the two holes, williams has a sight that fits "large octagon barrels with .5625 hole spacing" and marbles makes a #20 with 9/16 spacing will these fit, also are there any other options. Thanks