Not sure where to put this, so admin feel free to move...
I've got a Mk2 dash to go into the saloon, complete with all the ducting to direct air to the side vents on the dash. However, the Mk1 heater doesn't have the holes cut out on the sides for the ducts to attach to. On my old saloon I just left the ducts off, but on this one I'd like to have heat to the side vents if I can. Will it be a case of replace this part with a Mk2 item so the ducting can attach; can I cut the holes in the existing one (as it looks like the shape is there, just not cut); or will I need to replace most/all of the heater bits and bobs?
Not a great explanation I know, but I'm sure anyone who's put a Mk2 dash into a poverty spec Mk1 will know what I mean