Well if the grommet is available separately, you should be able to remove it from the new cable.
But maybe the old cable is the reason the grommet broke. You already have the new one so I'd replace it. Shouldn't be that big of a deal. Pull the console, detach from shifter/trans, and it should pull up through.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.