Hi Deejay
There is a forum called rimfirecentral - they have a thread specifically just for Mauser rifles . I am not by any means a expert - but they're are some guys there with great knowledge on the subject of Mauser .22 rifles . I own a few and think they are great - I even purchased the book by Jon Speed on Mauser .
Hopefully they can answer your questions there - but I personally don't think that the sight leafs are interchangeable :
I ordered a Williams WGRS-54 receiver peep sight yesterday, so I suppose I won't need a sight leaf after all as the primary reason why it was suppressed was to install a peep sight on the rifle. The next step for me will be to determine the type of peep sight which was originally used here... and to find one !
Such a pity Jon Speed's book is so very exprensive !
Thanks, Bob !
I eventually ordered the book from a French on-line bookshop (Librairie Le Hussard) - cost me 95 € (approximately $106), postage included.