From Marco or the game manual, you can find numbers and do an internet search.
https://www.marcospecialties.com/pinball-parts/545-6180-00
Currently only see #2 sail available.
https://www.google.com/search?client=firefox-b-1-d&q=545-6181-00
Send an email to Stern or a distributor to see if they have #1 in stock by chance.