That's called an offset screwdriver. The GP's use a different cover than Montes do, if I remeber correctly the cover over the speaker pops off but you have to pull the dash to swap the speaker.beenen said:if everything is the same as in my monte, the size 3.5 inch
i used this tool to unscrew the grill protecting the speaker..not sure what exactly its called
be careful tho..the magnet might be a little bit oversize and might not fit..i made mine fit but also cracked a little corner piece of the dash by the grill by forcing it in..not noticeable unless you really look at it closely
good luck
GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.