Now Ive spent the past week or so reading up on this dash swap and Ive pretty much pieced everything together in my mind. Everything except for the heater box that is..

Ive only seen one person mention using a mk4 heater box but it requires slicing some lines and results in an uncontrolled discharge of air.

Can anyone else who has done this shed some light on which heater box is necessary to have a fully functioning hvac system?