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Looks like item 5 in this pic:
View attachment 577981

Looks like this will do the job 45162FC090

Edit: Looks like I was a bit late

@don1952 @TMX , what about the hose that attaches to the green outlet in the attached picture of the header tank? What is its part number? I am struggling to find it in any parts diagram and I would like to add it in my shopping list. Thank you guys!

 

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Thanks Don, I had seen that pipe but wasn't sure...
I wonder if it can be changed with the heads in situ (on the side of the engine bock) like you had previously mentioned about another pipe