well so far im still waiting for mine to be attached, but i believe you need the loom adaptor for the JVC to car , there is also a steering wheel adaptor which i have bought, plus the fascia which is an all style kit, includes single DIN, double DIN
i got my bits from Car Audo Direct, i somehow managed to order two lots of fascia and head units, but as i was away due to work commitments, i exceeded the 7 day return policy, so i think i fairly priced the items brand new, check their website
So in summary you need :
JVC head unit
Fascia
Stalk Interface
Loom adaptor