Thinking about swapping the stock omnium chainring for a Sugino Zen racing chainring. My questions are: Am I going to have problems installing the zen? Do I need to purchase new bolts? Any help is much appreciated.

I don't think you will have any problem swapping them out. You should buy a chainring nut wrench if you don't have one.

thanks so I can just use the same bolts?

Nope, don't need new bolts.

omnium chainring is 5mm thick.
could possibley need new bolts, depending on new chainring being used.

well I'm gonna be using the sugino zen racing chainring. anybody running this combo?