Hi mate, I picked up an OEM Blakpunt stacker to fit my MK IV. Plugged straight into the back on the stock headunit. Can't really see why you couldn't do the same on a MK V. Maybe get hold of current brochure or check out a parts list to see if they're compatible. My stacker is in the boot and came with the cables to run under the carpet..
G/L.
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