To use the GM version you must slice some ( evenly) off the bottom, been there.
Your original has a Flat bottom, the size of the gutter. That one, and the 3rd one are the ONLY ones that will sit FLUSH to the Bottom, yeah been There.
Too firm, they will pull out of the gutter, and cause issues closing.
# 3 passes the dollar bill test. gets a grip, but can pull out without ripping.
#3 has a perfect SHELF to fit under the gutter lip.
1A auto FTW.... next?>
Let You and the garden hose be the judge...
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