Nope, it's factory. It's a square nut welded to the side of the shifter that accept the zerk; seems to be an A833OD thing. I've only ever seen it on trucks and Hurst-equipped F-bodies. I have three of 'em, two from trucks and one from a '77 Volare Premiere 4-door, of all things. Top-tier Volare, Super Six 4-door with a friggin' stick--a Hurst, no less.
