Are you looking for a glow in daylight fiber optic to use without the hood or with a modified hood? An alternative I have on all of mine is a tritium front sight insert from XS Sight Systems. It is not their replacement sight set, just the dovetail insert for the ramp that you use with the stock rear sight and the stock ramp hood. It shows up white in bright light and green as the light fades. Works great for dawn and dusk when there is insufficient light for the fiber optic inserts to glow.
On my 366's the replacement is part number 10-2008-350-4 Standard Dot Tritium .350 H, .340 base. Fits the stock .375 x 60 degree x .095 dovetail. It costs $60 but is well worth it.
Tom, does the POI change from daylight to dusk? I use the top edge of my front sight to aim. I am concerned that using the green dot, which is not the top edge, would cause me to shoot high.