Yeah, it's always good to have an extra spare G07 flyback around. Also, don't immediately discount every old G07 flyback as junk - lots of them were replaced over the years, and the replacements are just as reliable as the new ones you buy now. You can usually tell the factory original ones - if they have a label, it'll have a green part on it, and the casing is white as opposed to grey or beige.
And HOTs don't really fail with age - they're transistors. Usually they only blow because the flyback fried them.
-Ian