Have you tried a utility knife? You cut on the back not on carpet side. The backer is a different animal.
Those razor type carpet knives work EXTREMLY well . Much better than any Utility knife can or will
Just be very careful, you can loose a finger real quick
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original 69 charger brochure shows grommetNO grommet is correct for '69
Maybe it does, but then some bean counter determined that they could save 15 cents / car...original 69 charger brochure shows grommet