Here are some recommendations from members for Paragon transmission parts. Please feel free to add more recommendations:

ALTO Products Corp
One Alto Way
Atmore, AL 36502
EMAIL:
sales@altousa.com
PHONE:
251.368.7777
FAX:
251.368.7774
Here is their parts catalog, they have all the rebuilt parts for all the Paragon transmissions, and many other brands too.
http://www.altousa.com/pdf/catalogs/catMarine.pdf

Jack Klerk says: This is our very best group for paragon repair. . But, they are the best in the mid west By far. Our family has used them for many years. Honest, fast, good guys to work with.
http://www.kalamazoomarinegear.com/

Overhaul Rebiuld Kit For Paragon Marine Transmission P21 And 31 Clutch Plates. Chris-craft Transmission Oil Fluid Cooler 283f 327f 283 327 Paragon Hf7. Gasket Kit For Paragon Marine Transmission P34-35 P42-45 Alt23809a. I have a 1974 Chris Craft Explorer the engine is not orginal but it is a 409 Chevy V8. The transmission I don't think is the same vintage as the engine but it is definitly a Paragon possible PL or PM. The tranny fluid is brown so I'm not sure if it is engine oil or old tranny fluid. I am going to try to get the model number off the tranny to get a better idea.

Paragon Marine Cfx Transmission Manual Diagram

www.marinegears.comhttp://www.marinegears.com/in-line.html Also called Transmission Marine 800-462-8848 ext 98
call and talk to Mark Waite, he's very familiar with Paragons. They have Paragon manuals too.

Paragon Marine Cfx Transmission Manual Transmission

Great Lakes Power www.greatlakespower.com
They also produce and stock Paragon parts. http://paragonmarine.com/