Pentax 67 Angle Finder (Seagull + Nikon adaptor?)

I have a Pentax 67 and recently bought a Waist Level Finder, however I have problems with light reflections on the screen and (in this Canikon digital age ) don't really want to wear a towel over my head.

I do have a Seagull angle finder (to use with my other kit) and had heard that the Nikon round adaptor would fit the Pentax 67.

Anyone know?

Appreciated!

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Pentax ME Super, MZ5n, K10 + Lenses: M 24, 28, 50, 135, Sigma EX 105, 24-70, 100-300
Pentax 67ii + Lenses: 45, 75, 200
Other Stuff.....

Hi All - still don't have a definitve answer on this, but am willing to give it a try and buy the adaptor (and share), IF someone can tell me how the rubber ring thingy comes off the eyepiece of the 67 metered prism. Can't find an instruction manual for it; it may unscrew, but this may just be a diopter adjustment. Can't afford to break it

Anyone know?