PBL has the plain screw fin ones in stock, and pbr has the fin and screw fin versions in stock. I guess it depends on which one you need. But working on a stern sopranos, it is just the screw fin version.
Pbl
https://www.pinballlife.com/mm5/merchant.mvc?Screen=PROD&Product_Code=237-5957-00
Pbr
From the link above
Fin Shank Mounting Screw
6-32 X 1-1/4”
237-5883-00
Spiral Fin Mounting Screw
6-32 X 1-3/16”
237-5957-00