they , as said before, didnt come with them ,but since the parts ghouses sell them ,everybody thinks they need one...

just dont top off , cold , abv 3" below the neck....you should be ok..

when I got mine I had overheating problems (as many do) and to figure out how much I lost , and to stop getting coolant on my drive way , I installed one....

have not removed it..

But I yook the w/s water container bracket off the place it was, mounted the overflow thare, then welded the w/s water bottle bracket to the overflow bracket...so they are in line