Hey Alan,
Where did you find the spare roof?
I've got to do the same thing to my 56.
Thanks,
Zeke
PS: If someone ever started making replacement panels for this area they would make a killing!
I got mine from JIMBO59CHEVY here on Stovebolt in the PARTS forum. He has a lot of TF stuff & has always been very fair with me. When you get ready to do the replacement let me know. I can give you a few pointers after doing mine.
You can buy a new repro roof and the inner header, but the inner is over $300 & the outer over $350 plus shipping. I'd go with the used parts.