The Discus will require an adapter ring for the the install. The speakers in those cars are approx 6.25" round midbass drivers. Many 6.5" speakers will slide down into the housing with a little bit of wiggling and a bit of shaving is sometimes necessary.

If you are amping them then you don't really need to worry about the midrange. It ends up being easier to tune the system running a 2 way system. We are working on a plug and play amplifier(stage 2) for our stage 1 customers! Will be ready very soon!

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2009 E70 X5 - Third Row - Rear DVD
Past - 04 4.4i Sport Package