Here's the Hi Viz. At $43.20 plus shipping, the work in the other link looks like a deal. IF you can find the one you want on ebay, they're often < 20 bucks. LMK what you find if you will please. I'm looking to do something with my Mark II stainless bull 5.5" one day.
Not Rev - but....I have have HiVis fiber optic sights on both my Redhawk and Mark II. On the Mark II, I have the v notch rear sight. On the Redhawk, I have the square notch. For me, either works OK. No difference.