Anyone got a 94 heater matrix? The car is a 2L Turbo Wagon.

I started getting steam rising from the heater vents & small trickles of water running down from behind the dash. I had to disconnect the pipes going to the matrix from the engine bay & bypass it altogether.

I did contact Jap parts, they have on, but they need a picture to confirm it is the right one.
I really dont want to strip it all out & not have a replacement to fit straight back in! Am really not looking forward to doing this job.
Can anyone help on this one? The evenings are starting to turn cold
Thanks.