fc3dedfd_Fireside_Girls___Disney_Wiki__Notes
[Episode] "Phineas and Ferb video game" [Patches] Tire Changing Patch [Notes] 
Gretchen mentioned this in the Phineas and Ferb video game, so it can be assumed that this is a real patch, despite never being mentioned on the show. If such was true, most Fireside Girls must have earned this patch, in The Fast and the Phineas.
Fireside Girls - Disney Wiki
Notes