DVX bayonet rings?

I just purchased a dvx100a from ebay, i plan on getting either a Opteka .3 ultra fisheye or a century mk2 fisheye lens for it. the main deciding factor is the bayo mount of the century lens.

however, searching online i found a few bayonet rings for 72mm threads. but i am not sure which ones work.

i am basically asking if there is a ring available that i could screw on to the 72mm opteka threads to use as a bayonet mount for my dvx?
 
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