Thank you soo much. Looks like I know which one to order then. Brownells lists them in .020",.030", and .060". So it looks like I know which one to order now.

I am out of town this week, and hoping to head on a hunting trip this weekend. I borrowed my old Genesis from my friend for a buddy to use, so I have it with me, but don't have my calipers or anything else with me so I was unable to measure it. After cleaning the gun, I somehow broke the fiber optic sight tube. Or it was broken already and I just noticed it then. I'm not sure which. Either way, I figured it would be nice to get it fixed for them. Luckily, the gun is scoped, so the sights aren't too important for this trip, but they do get used as it has see through sights on there.