The long screw in your bottom picture is for the spot in your second picture. The screw on the front of the door panel is the same screw that goes behind the chrome door handle.
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1998 Supercharged Riviera - Custom CAI, Alpine spx-13ref, Infinity 6x9's, Alpine 4 Channel Amp, Kicker KX3, Silverstars, STB, Hawk Brake Pads, Monroe Air Shocks, KYB GR2