I had posted this earlier, but the thread kept moving around..
MPC did the '68 through '72 Impala hts (and '68-70 convertibles, as well as a '71 promo convertible), and the '73 through '76 Caprice hts. The '76 has been reissued under AMT and MPC branding.
AMT did ht and convertible annuals from '58 thru '67, and a modern tooling '67 ht, a non-stock '68 ht, and stock '69 and '70 hts (the '70 has been reissued many times). AMT also did a promo-only '61 Impala 4dr ht.
AMT did a modern tooling '62 Impala convertible and Bel Air ht also.
Lindberg did the '61 ht and convertible.
Revell has done the '58 ht, '59 ht & conv, '60 ht, '62-64 ht, '65 ht & conv, and '66 ht. Revell also did the '91 Caprice (Police/Taxi kit), '94 Impala SS, and an '00-05 Impala police car snap kit.
I think I have every 1:25th Impala/Caprice kit in my stash, except for the '58 annuals (I have the later AMT '58 ht w/ opening doors and the Revell '58).