When I replaced mine a few years ago, they were all the same size. Are you sure it isn't just deformed a bit from the slide "squeeze"? I don't know of any reason to have different sizes unless there is an issue with the slide alignment when closed that could not be corrected with adjustments. Does seem strange.
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Stan and Terri
Oak Harbor, WA
2008 Chevy 2500HD D/A
2007 Cruiser CF30SK
Glide Ride Pin Box
Reese 16K Slider
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