I have a 1995 MarinePower (GM) 6,5 l (396 cid) turbodiesel (275 HP) in my boat, and I am in desperate need of a new heat exchanger for this. The original heat exchanger is delivered by R&D Enterprises http://www.rdent.net/index.html. The length of the heat exchanger is about 24" (610mm) and diameter is about 6" (152 mm) Can anyone here help me find the same, or a similar heat exchanger, or possibly direct me to someone who can help me ? Please check pictures below.