This assembly is much stronger than the OEM unit because of the larger size 21 CV joints. In addition, these half shafts are machined from 300M and the outer flanges are machined from 4340 Chrom Moly. Direct Viper Generation 2 or 3 replacement with modifications to OEM outer hub required. (Two required). Due to the custom nature of this part, please call 1-866-508-6394 or contact us to order.