Hood, for what's it worth............
Hole spacing when it comes to replacing, or changing out sights, on a T/C has been the only way to fly for years now.
To the best of my knowledge, there is nothing in print that can help you with this, especially since T/C is no more. Even back then, when they were up and running strong, the only way their Customer Service Dept. could help, even then, was by you giving them "center to center' hole spacing.
Make, Model, Caliber, and Serial number did nothing for you...but having that "hole spacing" handy could get them to at least talk to you.
Good luck on your pursuit!
Uncle Russ...