groove already filled in, however, i DID ask this very same question when they filled it in prior to installing the sides. they said DON"T WORRY ABOUT IT...and i have to take them at their word. they are the best. they are using a PERMANENT green glue type shit i dunno what it's called but those sides will NEVER come off. they said ABSOLUTELY DO NOT USE THOSE STUPID STRIPS OF TAPE!!!! they are crap, and the sides will come off in no time!!! hope this helps