Choosing a diopter for the Pentax 67

I need a couple of diopters for my P67 penta finders. It occurred to me to simply try to match the dialed in correction on my Nikon digicam, but I am unsure if it's really that simple. Any advice would be greatly appreciated. Thanks.

I use Nikon DK-17C correction eyepiece with ptfe tape, because thread not match.

LevC said:

I use Nikon DK-17C correction eyepiece with ptfe tape, because thread not match.

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Excellent!

I would not have thought of that and these are much less expensive and more readily available than the P67 specific diopters.

Thanks.