I found this thread about installing 6.5" speakers in the front doors. It was on the old forum posted by computerkiller.

ok people u might know the aveo has like 5 in speakers well the hole in the door allow 6 1/2 if u dont mind taking a drill to the door and useing speaker spacers because that what i done ill have to take pics to show you guys but it kinda tricky to do i found that only certirn speaker spacers work and once your get them in your got put something on the very bottom of the spacer so that when the window come down they dont hit your speaker magents ill try to draw up a digram or something to show




THIS IS JUST THE DIGRAM THE PICUTURES ARE BELOW
if you are wondering where i got my spacers go to circurt city roadshop and ask them for spacers for a 6 1/2 speaker it will cost u about 14 bucks
He used some speaker spacers from circuit city. All I could find online was these. Do you think they will work.

http://www.circuitcity.com/ssm/Metra-Un ... tDetail.do

Computerkiller, are these the same spacers that you bought.