The 3/8 x 5/8 x 5/32 Halo series of bearings are a high quality steel/chrome bearing with metal shields. These bearings have been tested and proven by many racers.
3/8 x 5/8 x 5/32 Halo bearing by Avid Racing Concepts is the standard bearing for Associated diff outdrives. Check your manual for the correct size for your vehicle if you are not certain.