No2 mk4 sight aperture

[Father Ted]

I have a Parker Hale converted trainer that has the graduated markings on volley peep sight. What is the correct PH aperture to equip it with, apologies but I can't seem to find my book and it didn't come up in search.
I know some of you have these, do they function well or is it just collectors item? Are they unobtanium like rocking horse poop? What would fair price be?
Thank you for any input.
Cheers

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[Mk VII]

It's actually quite inconvenient, as you can't fold it down with the plate adjusted to hit the mark and you can't put it in a gun slip with the thing still standing up. It's also difficult to reproduce the setting with the exactitude needed to punch the middle in a rimfire target. I traded this one off to someone for something-or-other.