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Tom I will answer one of your questions [(Plastic does not corrode but it does shrink and become brittle with age. Get back to us in a decade or two and let us know how those plastic drain tubes are holding up.)]

I put mine in 1996,(like these) http://whalercentral.com/articles.php?article_id=94 and they are as good as when I put them in. Maybe this depends on where you live.

ADDED:
As I have said before If some one was to do a full restoration on a classic you might want to go with original equipment...