Hope this helps, let me know if you need any other info.
Thank you
Casey from SWISCO responded:
April 17, 2020
Hello,
Your handle set is a very old style that we do not carry but we do offer a few promising replacements. Take a look at our 40-058 and 40-152 handle sets. As long as the dimensions line up to your original hole spacing, either of these replacements is likely to work for you. Thank you!