I made a simple holder from half inch plywood that was cut to be a friction fit over the fixed lens hood. Two slotted wood slips were glued to this to hold Cokin X-Pro grads (the largest available). The plywood has a rebate to hold a 105mm polariser (push fit).
Expect some vignetting but not so noticeable with crop sensor.
Alternatively fit a 82mm Cokin or Lee adapter ring to the lens cover. It is already threaded and use the Cokin or Lee holder but expect a lot more vignetting.
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