Welcome to the hq,I would buy the right o rings for the right job so call Trinity racing or have a look online at there site.Do a quick check on eBay and find another dealer who may sell them cheaper.I had some issues with my trinity heads leaking cause there are so.many o-rings.if you have some extra cash hit up Jeff from fast racing and see what he can do on a head set up for your bike.great guy to deal with and will be in your future for other upgrades when your ready.good luck and let us know how it goes.there is also a search box to help u find great info on this site.