On the WS9, its because all T/A start as Formulas. I.E. Pontiac Firebird Formula TransAm WS6. As far as I know all 4th gen Formula and TransAms have the WS9 code.
And WS7 is just a term slapped on to non original WS6s that put WS6 stuff on it, like the hood, etc.
And WS7 is just a term slapped on to non original WS6s that put WS6 stuff on it, like the hood, etc.