Overflow tank (where to buy ?)

some of the v8 cars ive seen have a different placement of the filler opening
 
They're only like $15-20 brand spanking new from the GM parts counter.
 
Was it cheaper than 15-20 bucks?

I just purchased one from GM and it was 21 bucks they are still stocked. Also got an OEM oil pressure sending unit. Mine was dripping oil around the ceramic or whatever it is part.:redface:
 
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