This Rubber Stop from Miller Industries is used on the boom assembly of Vulcan
810 Intruders, Vulcan 807R and Century 301, 301M, 311 and 312 Wreckers.
Rubber Stop Vulcan 810 Intruders and Vulcan 807R Wreckers Century 301, 301M, 311 and 312 Wreckers Product Dimensions: 2.9"L x 2.9"W x 2.4"H Inner Diameter: 0.87"&0.3" Outside Diameter: 2.9"