Searching for Amdrican crafts pro 50 double sash lock

Thanks for posting. I am afraid I couldn't cross-reference that information to a specific window lock. Can you tell me the distance between the center of each mounting hole on the lock? That's a great way to narrow possible replacements down. We'll do our best to help from there. 

Something like our 90-278 has that same hole spacing. If the backset (or distance between the center of the holes and back edge of the lock body) matches, then this might work for you. That said, I'm afraid I don't understand--why would you need to drill new mounting holes? Does the lock you show in your first photos not match what is on the window sash? Please specify and we'll do our best to find something better, if necessary. 

Dimensions for 90-278