Specifying OE gaskets means that you are buying gaskets made to Japanese quality control standards.
Specifying only genuine CMS gaskets means you are fitting the same specification gaskets that were deemed good enough to use when your machine rolled off the production line.
The question is, why would you order any other make - well you probably wouldn't!
Genuine OE gaskets means genuine OE quality. Have you thought about trying this pro-workshop gasket sealant: 08CRAHLG120G, take your engine building to a more professional level!