I'm not sure but I can tell you that the nipple on top of the rad blew on mine. That part was cheap to buy. You can see what I mean here:

http://www.peachparts.com/shopforum/showthread.php?t=104716&page=2&pp=15&highlight=coolant

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1989 300CE Astralsilber/Schwarz
1992 300CE Schwarz/Schwarz