Isn't that a Moroso Accumulator in the pic? Exactly the same thing as Canton's Accusump but in a silver can instead of blue.
I wouldn't mount an Accumulator/Accusump on a roll bar like that if I had room further back and lower on the floor as it helps with weight distribution and center of gravity. I mounted mine where the rear bench seat used to be. I don't have a good pic of it but you can see it make a cameo in my camera mount video on YouTube. The AN-12 line is plumbed and runs by the passenger seat to the engine bay.