20x32x7 Revolution bearing (6804-2RS) by Avid Racing Concepts is the standard bearing for the HPI Baja 5B. Check your manual for the correct size for your 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)