Yes, with "T" nuts embedded on the back side into the graphite/epoxy firewall reinforcement. I buy alot of fasteners for my business and none of my fastener vendors have metric T nuts, but my local hardware store had them! They are thick steel and do not bend when torqued up. On the exhaust header, the Nordlocks just do not loosen until you want them to. I had to counterbore the header a little to get them to fit.
