Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
21-339	Rear	660lbs	5

The 5 leaf is heavier than the mono-leaf set up and is not meant to be a direct replacement unless you are looking for a little more height or strength in the rear. The front bushings are preinstalled but this spring does not include the rear bushings.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
21-245	Rear	575lbs	1

The front bushings are preinstalled but this spring does not include the rear Harris bushings.