Mdi retrofit for vrs

Hi all,

Looking for some advise.

I have a mk2 Octavia vrs with a bolero headunit. The headunit already had built in BT from the factory. I am looking to install the mdi kit as it only has the aux input.

Looking on eBay there is many options to buy the unit but I want to get the right one.

I wanted to check if I need to buy a new loom for the headunit with BT and MDI together or if I can daisy chain the connectors at the back of the headunit.

Here is an example of what I was looking to buy.

http://pages.ebay.com/link/?nav=item.view&alt=web&id=180729978836&globalID=EBAY-GB

Any help would be great.

Thanks all.