I am looking into buying a car, they said it needs a motor mount gasket . on 1998 Nissan Altima

I am wondering if anyone knows the importance in this and how much it will cost to put it in. please let me know asap

Asked by for the 1998 Nissan Altima
the part is cheap. the labour is not. have pull engine and replace mounts. i would bring the ride to nissan dealer or mechanic shop and have inspected before purchase(it is worth the cost to know what you may or may not be buying).