This is the cleat that secures the horn wire as it exits the bottom of the steering box, it also purposes to secure two of the steering box bottom plate bolts.
VW Splitscreen Transporter 22mm Link Pin 1963-1967
VW Splitscreen Transporter Cab Door Hinge Shim Kit
VW Splitscreen Transporter Quarterlight Seal Left 1952-1967 211837625
VW Splitscreen Transporter Quarterlight Seal Right 1952-1967 211837626
VW Splitscreen Transporter Pop Out Frame Hinge 1955 - 1967 221809179
VW Splitscreen Transporter Cab Door Inner Handle Fixing Kit 1963-1967