Exhaust Question

I am in the process of replacing my stock exhaust with a Trinity Exhaust. I want to order new bolts because I stripped one out. I also noticed that in the parts drawing, it calls for an exhaust gasket. When i removed the existing exhaust, it did not have a gasket on it. My question is, do I need to purchase a new exhaust gasket or should I just install it the way the existing was installed? thanks in advance

Mark Manzo