In most cases, Miles doesn't mater.
Most pumps I've replaced go bad because old and/or weak coolant fails to protect the seal. Part of coolant additives are lube and plasticizers for the seal. (Plasticizer keep it soft etc.)
Many people think using 50/50 premix after flushing is good but guaranties weak coolant because engine and other places hold plane water.
Bad Bearing for alt, WP, and others is often cause by people over tightening the belt(s). That can kill them very fast or wait a few month to couple years depending how tight.
Is why most OE Serpent belt setups use a spring tensioner. Keep belt tight all the time but won't wreck WP etc.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave