I am going to go ahead and get a Stewart Warner 10611 (11 vane cooler).  Neither aircraft spruce nor pacific oil coolers can tell me what I need to know, and that is:  Can I get a pre-formed transition piece/plenum for this cooler or will I have to lay one up.   The one I have now is obviously a commercially made piece.  If someone has any info on this I would appreciate it.  Thanks.

Steve