Had to happen again someday: clutch master cylinder went out on my 1988 B2200

Well, today in routine "check oil, check fluids" on my 1988 B2200, noticed that the level of fluid in the clutch master cylinder level was way low, below the lower line. I hadn't experienced any clutch issues, check everything for external leaks and saw none, even pulled back the slave cylinder boot to check for leakage there. So I suspected the rear seal of the clutch master, leaking into the truck. Yep. I had a RockAuto closeout clutch master on-hand, so installed that after bench-bleeding it. The recess on each was 21.5mm deep, so no clutch pushrod adjustment was necessary. Now someday I get to see if Advance Auto will honor the lifetime warranty on both clutch cylinders; I have cores, last time I changed out either was in 2008.