That's correct, from memory a duct comes up from the 'heater box' to the L/H side vent and from there across behind the gauges to the R/H side, so you need to get all the duct work from a factory set up as well as the large round vents are different, i don't think there is one on the drivers side with a/c and the passenger one is different, if i get time later will go out to shed and take some pics.

Cheers Mark