Overflow bottle

Got a lot of 73+ parts on my 72. Still learning what all I have. I know the front suspension and rear axle for sure, and of course the center caps aren't correct either but I like em better than the acorns style.
I have a lot of NOS stuff for it But They don't make a lot of remand stuff for a 73 like over flow tank and 73 was the first of 2nd gen so they mixed some sheet medal with 72.70-73 trunk pans are the same but 74 is diff 73 doors are 0ne year only tail panel is 73 0nly. A lot was 73 only