I think AO Smith provides that motor to Pentair/Sta-Rite and it should be motor number USQ1102.
You can try looking at this page: https://www.grainger.com/Grainger/AO-SMITH-Pool-Pump-Motor-5PE32
Once there, if it looks like your motor, click on the link for repair parts and it shows a capacitor. I don't work for Grainger, but have bought stuff from them, very reputable - you might be able to find a reference you could use local.
BTW, I don't have one of these pumps to verify any of this - just trying to help - so keep in mind I'm not running out to the yard and double checking. Still, a starting cap is relatively cheap, so....