Spicer transmissions were not that popular in the '50s. There really are no catalogs available that I know about. I have several PTOs, but they all came off of either Clark or New Process. I think you will have to find a transmission which is known to be a Spicer and has a PTO on it. We used PTOs back in the '50s to pump off gasoline. It was complicated then and has gotten really tough after 60 years.
