just thought i'd mention that most FelPro nissan exhaust seals are Poly Acrylite and not Viton like their intake valve seals. Says so on their packaging bags!
The Ford seals look like intake valve seals, but Viton usually doesn't have a problem with the heat that is transfered through the valves/guides upto the seal, so they will work good for that application.
I found a neat way to resist damaging a seal while installing is to take your old seal and turn it upside down and put it over-top the new seal and hit that with a socket. also, cut a straw and feed it over the valve stem before putting the socket on it. the squareness and the rough casting of some shitty sockets will mar the stem and that's not a desirable thing. the seal against seal contact will prevent damage to the tightening springs and will allow the top of the new seal to slide down evenly and concentrically around the valve guide and valve stem. carefully move the valve down first, and then slightly pop it up like a millimeter to see if the valve will bulge itself. if it does, you went too far (too late, anyways!) and if it doesn't bulge up, then give the valve some action over and over again to make sure it stays that way.
I've never had a problem with nissan valve seals doing it this way and it's the method I used the first time on a friends 1.2L Micra engine and it worked out fine.
It may take an extra 20 minutes to do an entire head, but hey... works for me since I'm slow already!
sucks that the cars rings are leaky though sweet little car.