O.J. Simpson He-licopter Pilots Become She-licopter Pilots

Two L.A. helicopter pilots who went mano a mano during the O.J. Simpson saga are no longer mano -- they're both women.

TMZ broke the story ... former KCBS pilot Bob Tur -- who famously shot the Reginald Denny beating and covered the O.J. slow speed Bronco chase -- underwent sexual reassignment surgery and is now Zoey Tur.

Former KNBC chopper pilot Dirk Vahle was a fierce competitor of Bob's during O.J. ... she's now Dana Vahle.

Tur and Vahle were the first 2 chopper pilots to spot the O.J. Bronco ... and they fought publicly over who saw O.J. first.

The 2 hated each other back in the day, but now they're bosom buddies.

Tur was on TMZ Live not too long ago and talked about his transition. It's pretty interesting.