Thanks.
I just looked at Troy's website. It did not appear to be fully operational. I found some Troy 3" length rails on other websites. They look good. But the front sight rail on the Ruger 10/22 SR-22's that I have seen is fairly tall. I measured the rear rail that is fixed in place on my rifle. It seems to be about 3/4" in height. I found another 10/22 rail that I had in a box of spare parts. It is longer, approximately 4 3/4" long, and not as tall, approximately 1/2" in height. Not sure if that 1/4" offset between the rear sight and the front sight would be an issue.
I'll keep looking.
I'll probably just get a good red dot sight and use that 100% of the time anyway.
I was just hoping to get all the original parts since my rifle did not have the sights with it.