Wish mine was more of a survivor than it is.
The radiator shop in Nashville that did my friend's Z is Tanks and Tabs, 801 Fesslers Lane, Nashville, 800-874-2559. I went on the website for them, you can select the core # for the '69 Z, but it won't give you anything but the number. I'll check them out next week when I'm in town (realize it's too late to help with yours !), but with eventually 4 to do, I'd like to get a handle on a good source.
My '69 Z radiator has never been touched, tag is intact, '68 Z's radiator appears original, a little bumped and bruised, but original tag is there and intact, Z11's tag is being restored, X66's is missing. Have to go the repop route on it -