Hi Thomas,
Are you looking for the matrix core itself, or the whole heater box with flaps and control levers?
It is possible (maybe likely) that the matrix core itself is common to other heater boxes, but not the box itself. I note that in the heater repair document authored by David Billington he says:
"to repair the box, I purchased a similar second-hand heater from a BMC specialist for £29. I cut away the rotted sections and had sections from the donor heater box welded in their place, then I exchanged the relevant linkages"
As an alternative, you could consider replacing the heater box with an air conditioning unit which provides heating and cooling?
Regards,
Kevin
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