The GKTECH 4 to 5 lug front conversion hubs are a direct replacement of the standard item, and are designed to have the standard snap ring, and wheel bearing being able to be swapped over. Designed to be used with 12.8mm wheel studs. Remove your 4 lug front hubs, and replace with these 5 stud CNC machined billet chromoly units. Vehicle Compatibility: - Nissan S13 240sx - Nissan S13 Silvia - Nissan A31 Cefiro NOTE: Sold as a PAIR NOTE#2: Bearings are NOT included however the hubs are designed to be used with the standard bearings NOTE#3: Grease trap/ABS ring and snap ring are NOT included