Here are the numbers off the NAPA box for the thermostat: R943695 It also has the number 155 on it. It is a 180 degree unit and also comes with the rubber ring and steel sleeve to locate it in the housing.
Hope this helps!
-Mike-
1945 Chevrolet G 506 1.5 Ton Military 4X4 1967 Jeep Cj5 with 283 SBC