So deping on the month of your 96 it may be the 10 cut which is 06/96 and back or the 8 cut which is 06/96 upto 97s. If one key works the door/ignition/trunk it's the 8 cut. If you have doir/ignition key and separate round head key for trunk it's the old version. Dual key means double sided. Now the 10 cuts are only cut on both sides for convenience the locks only operate on one side of the key just cut on both so you don't have to pay attention to which way you put the key in. The 8 cut is different it's staggered wafers meaning the odd numbers 1,3,5,7 are one one side of the lock and the evens 2,4,6,8 are on the other side so that key has to be cut on both sides to operate.