Vintage Cars: 1969 Cutlass, 1969 cutlass, convenience feature

Question
What or how can I tell the difference between a 1969 Cutlass Sport,  S and Supreme?  I cannot find this info anywhere on the internet.  Please help.

Answer
I don't recall a Cutlass "Sport" for 1969, but that may have been the same thing as the "S" model.  There was the basic F-85 (real plain-jane, price-leader model), the mid-line "S," and the top-line Supreme.  The biggest difference between the "S" and the Supreme was the interior: much plusher on the Supreme, and it had a bit more chrome on the outside.  Other than that, there wasn't much difference (nearly identical engine/ transmission/ convenience-feature options).  Starting in 1970, the 2-door Supreme adopted a totally different, formal roofline, as where the "S" kept the fastback design.