I would check on the VW Car Audio and Electronics section that 9w7 is compatible with red MFD. I'm not sure you're going to get all the features that you're hoping for.
Also it depends on the version of RCD 510 as there is a "basic" and "premium" version which come out of different factories. The "Premium" unit is made by Bosch and part# is 5K0 035 190 A.
My understanding is that you need the "premium" RCD 510 unit, 9w7 bluetooth and white MFD to get all the bluetooth functionality "happening" (plus some recoding of functions/enable options using VCDS).
For details on coding see VCDS Technical Resources
If you have the basic 510 and red MFD you may be better off going for a "cheaper" bluetooth unit - as I don't think these devices support all the functionality that the 9w7 supports. Unless of course you're considering upgrading the other components at a later date.
Yes the carsystems ebay seller is apparently quite good. I haven't used him personally but many others have.
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