Evidently, there are two versions of Hi Viz sights n they are easily IDed by a Black or Red Key used to change the light pipes. The black Key is the first generation and it has different diameter light pipes which will hopefully solve the problem I was having in earlier post.
Version 2 has Red key and all light pipes are the same diameter.
If you have a MK I the part number is 12935 and it includes Hi Viz front & adj rear sight. (front pin removes from R to L w punch)
Ruger CS Rep is sending me new set of light pipes as I did not get full compliment to begin.
CS tech also gave me some hints on how to deal w spring. (compress w punch & hold w paper clip.) Thanks to C3's bag set close - I was able to try this and it worked on 3rd attempt. My dental pick was just too thick to accomplish the mission. The V notch is in & God, do I hope it works !!!