So I assume that these have hex heads? The short shank looks similar to the Phazer unit.
I'm gonna have to check on my Venture which are the hex and allen headed bolts. From what I can tell from the microfiche, both upper covers are Dsus with handles, clutch side middle cover are Dzus with handles, battery side middle cover are Dzus with either hex or allen heads and both small lower covers are hex bolts but I do remember that the rear bolt that holds the lower covers to the footwell are stainless allen headed bolts. Not sure though if they have a shank or not.