Went to see the car today.
Information is slightly wrong to what I had researched.
My 6 month old 730 only had the single CD in the dash and
www.realoem.com made out that the retrofit CD goes into the boot which matched the dealers comment of not being able to retrofit the 6 stack CD in the dash.
I saw today that the retrofit is not in the boot but the dash!!!
WHich means there is still space for the 6 stack DVD player in the boot!!
Mind you they are having fun with it as the first CD unit didnt code up and this is why I wasnt able to pick the car up today. Looks like Friday now.