Hi opsoff1,
I just stumbled across this thread again, but recently I've been digging thru a bunch of old SouthBend manuals.
So when I saw the catalog number "8187ZN" you posted above, I went searching for it.
Check out page 4 of the attached manual from 1948.
It lists a "8187-Z"....I am not sure what the trailing "N" would signify....
-brino
EDIT: maybe I read too quick...I thought you said you were looking _for_ the original spec sheet. Now I see you were looking _at_ the original spec sheet. I don't believe there is any new info in the file I attached. Sorry if I got your hopes up!