Left side lugnut studs

Had a 71 challenger with leftys.
Also have a 70 challenger I just bought, roller, it has leftys on one wheel.
I had 2 low miles 71 Challengers with left hand threads front and rear on the left side. Both were early build, unmolested cars. One was 6 cyl. 3 speed with small rear, other was 318 Auto 8 3/4