Greetings,,,
The modules are 3+" in length, just barely over. The width is 11/16". The spacing is just over 3", depending on how you stretch the cable.
I'm using 3" for length and spacing, and that's close enough for my needs. You could always carve a little plastic off the ends if needed. And, of course, the cable is actual 3 wire, not 4.
The picture on the site shows the tabs on the sides. Mine has tabs on the ends.
Keith