I got the collar pieces from a late 70's 4 spd truck. Tore my 73 column shift piece out and swapped it all out in my living room. It was very straight forward and looks like it came from the factory that way.

No cutting, grinding, or filling. There have been ads on here for the 3 collar pieces but I remember them being a bit overpriced. Maybe I just got lucky finding mine at a wrecking yard for 10 bux.