I've never seen export cars but the heater take offs I've seen were always on top of the head about in the middle to rear toward manifold side and on the water pump--usually with a 1/2 inch pipe plug in both if not used. Wouldn't think that had changed just because it was export.
As to the exploded view all I can offer is the parts manual plate 103 for the 23rd LH series. 22nd would be similar but the left vs right would undoubtedly be different. Maybe the 22-23rd guys have better resources. Am assuming your car has the air vent pipes--just missing the heater core and associated??
packardinfo.com/xoops/html/modules/myalbum/photo.php?lid=613&cid=70 There are several modern retrofit heater/defrosters available but the problem is all require 12volts. Mounting would not be a major problem. If yours is still 6v, then I think about the only option would be to find something from a parts car and use that or possibly an aftermarket on ebay.
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