One Bearing needed per side. You also need one new wheel seal per side. The Part number for these is 251407629. If you have an 84 Vanagon that the build date is 11/83 or newer where the last six digits of the VIN are 023 828 or higher then you need to use these bearings. If you VIN is lower then see PN 211405645D. From 85-92 you definitely need this bearing there is no question as long as your van is a 2wd. The hole in the center of this bearing is almost an inch in diameter (15/16). The early version of this bearing center hole is 3/4". If you have an 84 and you have a question in your mind which you need the best way is to measure the center hole of the bearing.