This 2.5" long x 1" wide Plunger Spring from Miller Industries is used on the assembly of Miller Wreckers. These include Century, Challenger and Holmes Wreckers. The spring is used on different assemblies, including body assembly, tow sling adapters and a heavy duty truck hitch assembly. Please see the features below for a list of wreckers and see the brochure tab for breakdowns. This part can be used to replace Part Number BF-43.