Not very important. The idiots at the 10 minute oil change
places are always forgetting to put those back on fully or even
at all on a lot of vehicles. Zip ties are wonderful for out of
sight repairs like that. If the screw/clip holes are torn just drill
new ones and if you can't use the same screws and clips just
use zip ties, they'll hold fine. If that isn't possible then I
wouldn't waste money on a new one. It just keeps engine bay
a tiny bit more clean and some may claim "aerodynamics"
help with gas mileage which is just B/S, so no, they are not
important at all if it has to be left off.
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