ProTech Underbody/Top Mount Box 18X24X60 Double Barn Door Style L/H White Steel Model 22-2355L-GW Regular Louvered It has a 2-1/2" channel

It has a 2-1/2" channel and fits a 1-7/8" diameter trailer ball

Extang Trifecta E-Series 04-12 Colorado/Canyon 5' Model 77660

0 - 04-06 (07 Classic) Silv/Sierra 5'8" Crew Model 92625

Height (in): 20

ProTech Underbody/Top Mount Box 18X24X60 Double Barn Door Style L/H White Steel Model 22-2355L-GW Regular Louvered It has a 2-1/2" channelProTech Underbody Top Mount Box 18X24X60 Double Barn Door Style L H White Steel Model 22 2355L GW ProTech Underbody Top Mount Boxes Secure, Weather Resistant, and Built to Last. ProTech Storage Boxes are engineered to provide unparalleled security and weather resistance. Designed for mounting on top of flat surfaces, these rugged boxes are as tough as the job demands. Dimensions: 18in H x 24in D x 60in L Secure storage to protect your tools and