There are many options out there when it comes to ball joints. We've tried the majority of them, and while they all last and perform similarly, the Febi/Bilstein joint is supplied with the nicest rubber boot. It is tougher than most, and will deliver the longest lifespan possible on a part that happens to wear out rather frequently. Vanagons have a tendency to beat up upper ball joints, but luckily it is a part that is very quick and easy to replace with simple hand tools.
Sold individually. Two required per vehicle.