360 la oil pump gasket

Building a 1978 la 360. Got around to installing the oil pump. pro seal rebuid kit. the gasket kit doesn,t have a gasket in it. The old pump looked like it had a gasket. does it need a gasket? on the internet some said not to use a gasket. is it ok for me to cut one out of an old ceral box. If not where can i buy?
any suggestions or information would be greatly apprediated.