Which are you referring to? The washer fluid resovoir for the washers or the optional "optikleen" glass bottle? The one on my convertible is on the driver's side in front of the wheel and it looks like the same one they used from 65 to about 70; - pretty generic GM stuff.
Im looking for the plastic one. I was gonna try to make one work from a 65 riv but did not work out so well.