here's one going on ebay at the mo mate []
http://cgi.ebay.co.uk/Subaru-Impreza-1995-...1QQcmdZViewItem
my heater matrix has also gone I have a sti v3, I spoke to the boys down at greersport about getting the job done advised price will be about £450 / £500, they advised the matrix it self is maybe about £100ish new but they advised to do the job they have to take out the whole front dash, steering wheel, and poss even the front seat have to come out so they can do it.
What I have do for the mo is I have just by passed the matrix by just linking the pipes in the engine bay going into the heater matrix allowing coolant to still flow and can still drive the car just means don't have any heat, also allow's me to keep driving the car while saving some penny's to get this done.
Alan.