Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1747	Rear	5,500lbs	10

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1337	Rear	10,350lbs	5/4

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1289	Rear	5,900lbs	10

This is the original version of this spring and there is also an HD (Heavy Duty) version available.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1849	Rear	2,700lbs	2/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1783	Rear	1,900lbs	3/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
42-813	Rear	1,650lbs	4/1

OEM # E0TA5560AZB / E0TZ5560K /  EOTZ5560AD

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-2051	Rear	6,785	10

Note: This spring is only for use on the F550 Chassis Cab. It does not fit the F550 Pickup

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1337HD	Rear	14,000lbs	6/4

This is a heavy duty upgrade to the rear spring

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-792	Front	3,825lbs	7

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-2069HD	Rear	5,325lbs	5/1

This is a heavy duty upgrade to the rear spring

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1749	Rear	675lbs	1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-623HD	Rear	4,000lbs	10

*1978 - 1991 E-350 except passenger vans. This is a direct heavy duty upgrade for the OEM factory spring. 

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-623	Rear	3,235lbs	10

*1978 - 1991 E-350 except passenger vans. This is a direct replacement/upgrade for the OEM factory spring. 

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-485	Rear	2,400lbs	6/3

This is a direct replacement/upgrade for the OEM factory spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-701HD	Rear	4,295lbs	6/1

This is a Heavy Duty upgrade for the stock springs. Its perfect for plowing and other heavy duty applications.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-695HD	Rear	3,100lbs	7

This is a direct heavy duty upgrade for the OEM factory spring. 

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-630	Front	2,250lbs	2

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-571	Rear	2,450lbs	4/1

This is a direct replacement/upgrade for the OEM factory spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-516	Front	2,200lbs	2/PD

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-723	Rear	1,655lbs	3/1

This is a Standard Duty replacement for the stock three leaf spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1159	Rear	1,100lbs	3/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1813	Rear	3,000lbs	4

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-903	Rear	1,350	6

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-901	Rear	4,350lbs	8

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-721HD	Rear	4,500lbs	12

This is a heavy duty upgrade from stock and is only for the F-350 Dually

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1679-2	Rear	N/A	1

This is a Clip Leaf for the standard 43-1679 spring leaf.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1279	Rear	525lbs	1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1717HD	Rear	6,800lbs	5/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1681	Rear	2,700lbs	4/1

This is a Heavy Duty replacement for the stock leaf spring.