The holes are 5 inches apart...the length of the black "housing" is 7 3/8 inches...tom
Paul from SWISCO responded:
December 8, 2016
Please see our 82-005 handle set, this appears to match what you have. The outer handle is different from yours, so you can either reuse your original or consider our 82-042. We also have a keyed version, the 82-306.