A great world of options out there for you. You might check some of the replacements from The Gun Works as they have some good variations. Personally if I need to see a little more light between the sides of the rear and the front, I would open the rear a little instead of filing the front. Somewhere around 1/10 of an inch seems to be one of the most versatile thicknesses for a front sight for most uses. Compared to the thin sights, it's easier to establish your sighting height with the thicker fronts.