Travelling along the E10 from Kiruna to Finland, at Svappavaara fork you turn left and follow the E45 toward Karesuando/Karesuvanto then if you are heading to Nordkapp I suggest you to stop at Karesuando Bensin. It’s the northernmost gas station in Sweden. They have anything you need and a few block away you can also find a cheap and cozy restaurant/cafeteria to relax.