No Vacuum Pumps Available?

[cs15dah]

After reading several stories about people nearly crashing because their brakes didn't work because their vacuum pump failed, I thought I'd try to stay ahead of the problem and preemptively replace my vacuum pump.  GM part number 12659655.  GMPartsGiant.com says it's discontinued.  Neither AutoZone nor NAPA have a part listed at all.  WTF??  How do I get a new vacuum pump??

 

Has anyone actually been in an accident because their brakes failed due to the vacuum pump issue?  I haven't read any stories of actual accidents, just a bunch of close calls.

[T Verner]

Backorder Nationally according to Dealer was hoping for a better answer.  According to NTB accidents have happened otherwise, No Recalls at least twice now depending on make & year.