Vacuum storage tanks?

Way back there I made a vacuum tank out of an orange juice can. One of those 1/2 gallon size. Popped a hole in the end to get the juice out, then soldered a nipple in the hole and made a bracket. Worked fine.

I'll bet there's not much of a tank on a C4, maybe a softball size plastic tank, and with all the electric stuff on the later years, probably none at all.
 
The C4s, vans, trucks and most other 80s and later cars use those little round vacuum balls with the 2 mounting ears. They are super lightweight & clean looking. I would go for one of those, they can be tucked in about anywhere.
 
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