what size speakers are in the rear of an 00 grand prix gtp?

i've got a 00 se grand prix and i've already upgraded my speakers both front and rear but i noticed that there are extra holes in the rear and i guess the gtp models have 8 speakers instead of 6. does anyone know the size of the smaller ones in the rear? no i'm not talking about the 6 x 9s.

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mylittlepiggy51765
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