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When I had to do that I could not find anyone selling a 5/16" square bit. I cut a piece of 5/16" square stock steel into several 1" to 2" lengths and welded them into some extra 3/8" drive sockets I had laying around.
I make sure to keep one behind the seat along with the block drain plug I pulled out when I installed the coolant bypass. With my luck, I know I'll be in the middle of no where when the hose blows and I want to reinstall the block plug.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.