Supporting pieces for the major BBK hardware are the header gaskets, bolts, and oxygen sensor wiring extensions. The gaskets are BBK's own and designed to take one re-torquing after the first heat cycling and then maybe annual torque checks thereafter. BBK also supplies the header bolts with its long-tubes; they are Grade 8 metric with an 8mm shank and compact 10mm head for clearance. The O2 sensor extensions are from Caspers Electronics (PN 109015) and sold by BBK. Like all BBK hardware, the parts are available from BBK dealers or its parts outlet, Brother's Performance.