I wouldn't pay anything like this price, used or repro. And there's plenty of used, this was just to show pic and prices of some. They seem to be nearly always rusty as out in the weather for 40 years, look for one with only surface rust or repainted to show smooth surface, not heavily pitted. GM #547861.
https://www.firebirdcentral.com/1977.../she-2529c.htm
And not shown on the 78 ad above, should also have this retainer in place to hold handle in bracket. And to save a whole dollar, it's probably the same retainer as on non-AC kick panel cable controls.
https://www.firebirdcentral.com/1977.../she-2529h.htm