ok, so a little more info... al three cans have a different umber stamped into the top:
The main difference I have noticed is that the height of the bottom of the can, that taller can starts out taller at the bottom.
There are the same amount of ribs on each can, but the ribbed sections are different heights.
It does not look like the small can has been crushed, no visible damage / compression inside the ribbed area.
However, I did notice a difference bottom of the cans. The two taller ones the bottom seems to be pushed out, while th taler can, the bottoms seems to be flat. Not sure if it will show up in pictures...but lets try.
Taller can, from underneath:
the rusty area under the horn ring is not flat.
the area under the horn ring is flat.
not sure what any of this means...but I think I will use the shorted one on my car.
Jason