Corrected my post below but put it here as well...

You don't have to BUY a spacer for the 6, 6.5 woofer up front but one is necessary. If you don't the glass hits the speaker and will not go all the way down.

My installer being the enterprising young man he is just used the Infinity speaker grille. Popped out the mesh, inverted the plastic and viola spacer. Sorry for the previous incorrect info.