To fit the MK5 rack, you need to modify the steering shafts so that they fit, also as has been said above you would also need to weld on the brackets to the bulkhead to secure the rack.

Why are you thinking of doing the conversion?
If its just for parking i wouldnt bother, as at high speed the rack you are on about would be VERY nervous and twitchy, what you would need to get is a load sensitive rack, one that senses when you are going faster and adjusts the sensitvity accordingly. Its a very difficult coversion to do correctly.