you should look for 4 inch, will fit perfectly, dont get the JVCs they suck, I dont know about other brands but my guess is they are all the same, because i did some research before buying the JVCs and they said they are the best better tan sony and pioneer!!! can you imagine. I've had the bad OEMs back at least they are a bit better the JVCs
The 2009 Chevrolet Impala has 42.3 in. of front leg room.
The 2009 Chevrolet Tahoe has 65.3 in. of front shoulder room.
The 2009 Chevrolet Express has 68.8 in. of front shoulder room.
The 2009 Chevrolet Tahoe has 41.3 in. of front leg room.
The 2009 Chevrolet Malibu has 39.4 in. of front head room.
The 2009 Chevrolet Impala has 39.4 in. of front head room.
The 2009 Chevrolet Suburban has 41.1 in. of front head room.
The 2009 Chevrolet Express has 40.2 in. of front head room.
The 2009 Chevrolet Impala has 56.4 in. of front hip room.
The 2009 Chevrolet Traverse has 40.4 in. of front head room.
The 2009 Chevrolet Tahoe has 41.1 in. of front head room.
The 2009 Chevrolet Suburban has 64.4 in. of front hip room.