I will store the driver's side seat for you, just sell it to me. :wink:
1. clean and treat the seats w/ a leather cleaner/protectant. wipe off excess.
2. get some ziploc bags and poke a bunch of holes in them. then fill them with some mothballs. this'll keep the mice and moths away from them.
3. wrap the seats in plastic with the mothball bags.
4. store in cool, very DRY place, OFF the ground, away from any potential water damage.