You dont absolutely have too but it is safer. I still have the stock studs on mine but did buy some long studs. They just arent installed yet.
These are all the part numbers you need:
*Studs for the front wheels: Moroso 46185 (need 2 packs of those)
*Studs for the rear wheels: ARP-100-7703 (need 2 packs of those)
*Lugnuts: WELD 601-1426 (4 per pack)----> OPEN END (the ones I'm using)
.............. WELD 601-1419 (4 per pack)---> CLOSED END (not 100% sure about this part#)