Group 27 Battery Holder 

"A simple-to-install battery tray that fits into a limited space. For batteries up to 10-1/2" in height. Provides simple installation for changing or replacing batteries. The polypropylene hold-down strap has a positive locking, quick disconnect buckle. Molded base mounts with four #10 panhead screws."

Fits: Group 27, ID: 12-3/8" L x 7-1/8" W ", Case: 6