Danny both of these companies you mentioned are still in business and when I worked for Fiat in Australia used to supply us with alternators and distributors.
Paris Rhone turned out to be an old fashioned company who did all of their business contact by mail.
On one occasion I had contact with them about pre war stuff for the vintage car club here. Material was no longer on the shelf but they set too and hand built it and sent it down by air at no extra charge. I sent them a book on Australia and after that they bent over backwards and always helped.
Some pictures of their factory they sent was like a step back in time.
Regards
Col