That has a 3 point fixing bracket to secure end can assembly to sidecasing.
This kit does away with the three M6 long socket cap screws that are supplied with expansion chamber and can damage threads when constantly having to remove the screws when removing the expansion chamber.
Kit consists of
3 M6x76 high tensile steel studs threaded 21mm both ends (self colour steel)
3 M6 20mm diameter penny washers (zinc plated)
3 M6 P type Nyloc nuts (zinc plated)
2 M6 nuts (for fitting the studs using the double nut method to fix studs into engine casing)
The stud kit is manufactured in the UK and is of the highest quality and standard.