I have two pairs of type 4 heat exchangers that I'm looking to sell. One pair is for round port heads, and one is for the later square port. Am looking for £70 per pair, and due to the weight of them I would ideally like them collected from Kidlington, Oxford. Round port pair - Casing is thin in a few places and will need patching but overall isn't too bad. Internals appear to be fine apart from the exhaust connection on one of them where a hole will need patching and one of the exhaust mounting holes will need fixing (see third picture). Square port pair - Internals seem solid on both, and casing in general but with a couple of places that would need patching. The right one is quite rusty around exhaust inlets/outlets, and there is also a hole that would need patching on the hot air outlet (see last picture). Finally, a couple of the bits that connect it to the head are loose and would need welding on again. All in all I think both sets could be made perfectly serviceable again without too much work. If anyone would like any more pictures then please just let me know. Thanks. Nick...