seal replacements like that can use the sheet metal screw method. Drive a few screws into the exposed part of the seal, then pull on the screw heads with needle nose vise grips. Only drive them in shallow so you dont get into the bearing behind the seal. You should start a new thread after...
I dumped those fittings and threaded normal nipple type fittings there. No issues, or leaks.
The press in fittings on the water pump seeped as well so i removed the pump, pulled the fittings, tapped the holes with 3/8 NPT (if I remember correctly), soldered up some copper fittings to exactly...