Hi! Congratulations! I know that Bob at Bob's Bird House had a complete roof. If you did not get yours from him, call him and ask him if he has a spare handle for it. You can also try John Draxler at Tbird Ranch. You might even try Don at Bird Nest. You can find their contact info in the Advertisements Forum down below this. Let us know how you come out.
Here is another possible source, though they feature VW parts. It is my understanding that the VW sunroofs often used the same parts we had on our Tbird Golde Tops.
Check this company out also.