4x12x5 Spherical Bearing (GE4UK) by Avid Racing Concepts is commonly used in the large 1/4 to 1/5th scale vehicles. Check your manual for the correct size for your vehicle if you are not certain.
Specifications
Outer race thickness is 3mm (4x12x5/3).
Bearing Dimensions
METRIC: 4mm (Inner) x 12mm (Outer) x 5mm (Width)
STANDARD: 0.15748" (Inner) x 0.47244" (Outer) x 0.19685" (Width)