Brian
I am assuming that you are new to K-F ownership. If you do not have the following documents to work with, please get them as soon as you can:
BLUE COVER 1947-1949 model year service manual
April 1948 Edition Kaiser & Frazer Illustrated Parts List
There are different versions of the clutch disc (determined by number of springs), each of them with different part numbers. There is a cross-reference for these as well, but you should be looking for the same type (number of springs) to determine what works best.