Help Identifying Cat Heat Exchanger

[waltini]

My new to me 1985 timber cruiser has thrown me a curly one. I am starting to do maintenance on the Caterpillar D333C or 3306 serial no 66D01651. Whilst talking to the Cat guy and trying to order parts he identified the engine as an industrial engine. This meant he can't help me with parts for the heat exchanger.

I can't find a part number on the heat exchanger and I was hoping if I post some photos someone can help me with the part number so I can order the correct gaskets/O rings etc.

Thanks
Ian