need a pic of master cylinder with manual setup
That Autozone PN is NG (no good) for discs; that MC is for a drum/drum system. The older drum/drum reservoirs have a residual valve in the front system, and that needs to be punched out... no warranty anymore. I would take it back, get the $ back and go to NAPA and get the part I listed above of you want the 15/16" piston MC. Autozone lists one new MC for disc/drum but it says it is for manual brakes and so probably has the 1-1/32" bore....and it is over $100. The NAPA new MC that I listed is in the $55-62 range, depending on your discount level there.