I'm not worried about judging because i guess I'm going more modified here. I'm going to be installing an electronic ignition system next week. Basicly i just need to know; if I order a Master Cylinder for a New Yorker (71-73), or an Imperial (71-73) ; if it will match up to the 4 bolt pattern on the booster I already have. I have disc brakes on the front now. I need a Master Cylinder that will fit this bolt pattern, & had discs & drums. Thats why I thought maybe early seventies. Loyal