I know everyone is suggesting jacks but I think the OP is looking for the spare tire rod thingy that is used to lower it so a jack won't help with that. If the junkers don't have anything, then a dealer should be able to come up with something.
If anything, wave down a Frontier driver if you have an issue on the road, lol. I am sure someone will eventually stop and help.
The following link was given to me by another member as i was missing the same parts. I picked them up at my local dealer for a little more but I'm here in canada and everything is more here. I bought the whole kit 99501 for about 30 bucks.