Point your browser to this WO webpage
https://www.williamoptics.com/access...Plate_spec.php
Then, <click> the “Dovetail Plate specs” link which should open the following PDF giving the dimensions of the WO Dovetail Plate.
Or...
Warning: Link below opens PDF file.
https://www.williamoptics.com/access...s/BA5-A006.PDF
Cheers
Dennis