I read about these on a minitruck site and it said that the large 1" bore will get rid of spongy pedal syndrome. Since I went to front and rear discs my pedal has always felt like there is air in the system. I've bled the brakes to death with no avail. I figure the FJ80 MC is worth a shot. Does anybody know if the 80 series MC bolt pattern will match up with a post 75 style booster?