Inland surfer fins

Anyone got an extra set of inland surfer fins that they are willing to part ways with?
I have a red rocket with the standard fins but I was looking to try a smaller set but I am not ready to spend $80 on a set that I may not even like. Or does anyone know of a brand that will fit these boards? Or lastly if someone has an extra set of the standard ones I can always cut them down on my own. TIA