Scout 45ci and Sport Scout rods has numbers 27-C-82 on the forked rod and 27-C-83 on the knife rod. I think same rods was used in the 841. There is versions difference in manufacturing, later year rods are regarded stronger than earlier year rods but the C/C length and markings are same. Main dimensions are exactly the same and all are readily interchangeable. 

My 37ci rods are blank, unmarked but they have piston pin bushings in comparison with 741 rods that also are unmarked but does not have pin bushings.

Jr. Scout rods are marked 20-C-134 and 20-C-135. They also are made without pin bushings.

Chief rods has numbers 27-C-1 and 27-C-2