Id dyna-ti doesn't want the Superfly, I would be interested. Subject though to clarifying what 'holds air indefinitely' means - holds air indefinitely when ridden regularly? (which would be unusual as far as I am aware) Or holds air indefinitely when propped up in the corner of the shed? (which is promising, but it hasn't actually been ridden by current owner?) I hope you don't mind my asking, but they were a bit notorious!
Incidentally, the brace is an earlier type, but tbh I've got plenty I could swap over.