Datsun
Roadster Bumper Parts from Rallye Enterprises, Ltd.
63-70I
have seen this on all the bumpers; but have also seen
examples of all the bumpers WITHOUT a mounting plate
for these. Your car should have a threaded hole in the
back of the frame to accept this.
From
Nissan.
85201-10400
Datsun Roadster Rear Bumper Bracket, Center
85201-25900