update surge tank installed..remember freeze out plugs

Unlikely that they made the item in multiple materials....unless you go aftermarket "upgraded". One of the reasons they use plastic is for transparency, looking in the overflow tank is how you tell what the coolant level is.

I have the same set up on my burb and reminds me that I need to change mine too...my radiator developed a weeping stress crack in one of the side tanks for the oil cooler and most all other plastic parts in the coolant system have been changed.