Just been looking at the speakers in the front of the car on the dashboard. They are compound speakers, a 100cm speaker joined to a tweeter to one side. The speaker enclosure comes away with a gentle pry with a screwdriver. The cover levers off and the assembly prises out. The replacement speaker from AO is a 10cm regular round speaker which will leave the hole for the tweeter unfilled, I'd go for a component set up, a 10cm speaker and a flush mount 4cm tweeter.
Just a thought!