From the same company that brings you the Envy Prodigy, here are some box ends.
5.5: For most Envy decks that are 5.5" wide
5.1: FOR ASOV4 LIMITED DECKS ONLY
4.9: FOR ASOV4 SOME DECKS ONLY, S8 STREET, S6 KOS. NOTE: This size will NOT fit the Prodigy S8 park model.
4.75: FOR ONE, COLT, PRODIGY KOS, AND SOME AOSV4