L31 (hood/fender mounted turn signal indicators) was only available as part of the A01 "light package" on a '71 Plymouth b-body.

28.3% of US spec. '71 Road Runners had A01 (~3,867 cars), there won't be a breakdown for w/N96 VS. w/o N96

1971 RR w-A01 L31 N96.jpg
AIR GRABBER with turn signals

1971 RR w-A01 L31.jpg
STANDARD Road Runner hood with turn signals

71 rr.jpg
OP's Road Runner

71_Satellite0006m.jpg