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Maybe no-one will speak to me again, but.............there is this company that
sells an oil cooler kit, complete with all necessary ducting, hoses, fittings,
etc., and it fits just fine in a Lancair cowling.
The WS cooler included is the 10599R
 
The company is Glasair, and their catalogue number is (was, at least) 221 0469
501.

I'm sure you could find them on the Web - but I wouldn't know about that of
course!