Do you mind sharing where you have found an audiobook of Zen and the Art of Motorcycle Maintenance? Doesn't look like it's available on Audible or Scribd.
https://www.audible.com/pd/Bios-Memoirs/Zen-and-the-Art-of-M...
"We're sorry. Due to publishing rights restrictions, we are not authorized to sell this item in the country where you live."