I found your website and it looks like your part 39-399 is the replacement for the Roto OP05-7532-03. Would you please confirm that this is a compatible replacement?
Tom from SWISCO responded:
May 29, 2015
I couldn't match that number to anything, unfortunately. The best way to determine if our 39-399 is a match is to compare your dimensions and style to the pictures we show on the 39-399 store page.