Left vs right hand thread wheel studs.

Yep "port" is left side as seated in the drivers seat. I had a 68 charger w those damn LH studs. I knocked em out with a hammer and went to my local corner auto parts store and bought 10 RH studs. Did the same w a 69 charger I had a few years later.

My 67 cuda and my sons 69 cuda are getting upgraded to cordoba big brakes and BBP. Thankfully It appears Chrysler gave up on that L/H R/H horseshit in the early 70s. Saved me the trouble.