The tab would be to hold down an electrical wire or wrapped group of wires.
Generally, a protective plastic sleeve would be used to cover it, in order
to avoid chaffing of the wire. The hole would be to bring it through the
firewall. Maybe, and I am guessing, it is pre stamped and set up for a left
hand drive. During manufacturing, most panels were made to be used either
way. This way there was no need to make up two stamps. On my TR3A I have the
some tabs and holes for the same reason. A simple rubber plug was used for
holes which would not be utilized.
Robert L. Gannon
http://home.comcast.net/~trsix74/wsb/index.html
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