Hi everyone-I'm wondering what the CRP replacement evaporators are made from (hopefully copper/aluminum) and what kind of luck people have had with them. I'm contemplating buying a '92 300D 2.5 that has a known bad one, and @ 20 HOURS of labor for R&R, would like to only have to do it once!! Thanks in advance!

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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K