This part fits the following make/models: 1999 - 2008 Ford F250/F350/F450/F550 Superduty and Excursion This eyebolt measures 18mm x 150mm, comes complete with the nut and is designed specifically for this front eye application. Changing the front springs on these trucks almost always requires cutting the old eyebolt out because the factory...

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1289HD	Rear	8,000lbs	10

This is an HD (Heavy Duty) version of the original spring. It's heavier than what was originally offered on these trucks from Ford. 

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1291	Rear	750lbs	1

OEM # F81Z5560BB / F81A5560BD   This is a direct replacement for the stock single leaf helper spring.

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
43-1289	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
43-1747HD	Rear	5,500lbs	10

This is a Heavy Duty upgrade for the stock springs.