Help find correct bases

I've got an older Knight muzzle loader that I have probably had for close to 10 years, if not longer. It is the "American Knight" model. It is D/T for scope bases, but I have yet to find anywhere that sells any specifically for that model. I'm sure there are other rifles with the same spacing, but all of the websites I have found list the application for the bases and not the spacing. Anyone know a site that would show the hole spacing so I can order that way?

does this help?

http://www.knightrifles.com/talley-scope-base-and-ring/

I would contact the manufacter and talk to them, they can tell you if that will fit. I will try to google some more