My 06 has 3 screws on the door speaker it's factory yours must have been changed therefore just use a small screwdriver and pop off the grill.
That is an awesome looking grill, at least it happened in your garage not in an open public when everyone is admiring your viper, that would be too embarrassing.I used to have grills like these on my doors until one day my shoelace loop hooked onto one of the spikes and caused me to fall onto the garage floor as I was getting out of the car . I flopped around a little bit on the garage floor before realizing that half of the speaker grill was hanging off of my sneaker
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