Hello! The best "T" handle for your operator will depend entirely on the diameter of the hole for your old handle. Have you had a chance to measure that yet?
Since your operator is Caradco, odds are the diameter is going to be 11/32". With that in mind my top suggestion would be the 39-102. I feel pretty confident that this will work for you but you'll need to measure your old hardware to verify.
I'm afraid that the 39-103 part number you gave isn't one of ours. Could you have been referring to our 39-102?
If so, then I can't verify whether or not this will work on your operator. Without seeing pictures of your parts, I don't really know what you have, so I can't make a judgment call. What I can tell you is that the 39-102 is designed to accommodate an 11/32" spline, so as long as the hole diameter in your old handle is the same size as that then you should be good to go.