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That pic is of your regular horn, not alarm horn.
The factory alarm horn is a small disc style horn, maybe 3.5-4 inches wide or so. It's around the front crossmember.
There's no key in your door.
Very few SCs came with a factory alarm. Yours is aftermarket.
You need to just start digging around, under the front passenger floorboard, up under the dash, in the front trunk area, to find where they located the brain, horn, etc. and then just start tracing wires.
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