Thanks for the info, gentleman. I had not considered aftermarket but after your suggestions I went back through the Brownells manual and found the Marbles sights. They even list which one that fits the 760.
The Remington site provided plenty of resources around the country where I may obtain an original. I made a couple calls, but no luck yet. I was told by one fellow that he just sold the last one he had, but he gets them pretty reguarly. So it looks good that I'll be able to get an original.
I didn't have much luck on the Lyman website, but I don't think I got to the right area.
Again, thanks for the assistance.