20x32x7 Revolution bearing by Avid Racing Concepts is the standard bearing for the HPI Baja 5B. Check your manual for the correct size for you vehicle if you are not certain.
Bearing Dimensions
METRIC: 20mm (Inner) x 32mm (Outer) x 7mm (Width)
STANDARD: 0.7874" (Inner) x 1.25984" (Outer) x 0.27559" (Width)