That truncated cone shape device is the rubber housing over the lamp socket for your rear facing light. The metal bracket you have been asking about creates a housing to mount and protect the lamp and switch assembly.
Your MK-II mortar carrier uses Single Pole wiring. That wiring diagram was previously posted to you on your FB page identification request.
A similar original assembly is available from Stefan in NL at LWDparts.com
Last edited by Michael R.; 16-01-20 at 18:05.
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