I just got new LBBB (little blue bit of bling) in the form of an anodized oil cap. It says on the package "Install according to instructions" but there were no instructions. Now yes, it seems stupid simple, but when I unscrewed the stock plastic plug I realized that there is no rubber o-ring on the new anodized cap. So do I reuse the stock one or does the anodized one not need the o-ring?