It's hard to say what you have based on this picture alone. Do you know the size of the spline? If not, can I see a picture of the spline on the operator itself (with the handle removed, of course). I would also like to see the inside of the handle. Thanks!
Can you confirm that the spline size is 5/16", and not 11/16"? 5/16" is relatively uncommon and not used by Truth, while 11/32" is. Is there any possible way we can see the operator itself? That will be a huge help in finding the right part.
I'm going over there today, I'll take some pictures of the operator too.
I'm sure that if you say that the sizing would be 11/32, that it must be. The operator arm definitely says Truth on it.
Thanks! Let me know. Also check the spline just in case. Always better to know for sure, in case the original installers did something weird. It's been known to happen!
Thank you for the help Tom, I ordered two handles today...