This buy it now listing is for one (1) Drive Shaft Block for the M38A1 and M170 Jeeps. This is the block that mounts in the center of the carriage assembly in the rear gear box of the rear axle. This block wears out over time, and it is a very wise idea to change it out when it starts to wear down. These are NOS items, high quality, and unused. Buy with confidence. We gladly combine shipping.