I have a Pedersoli Remington rolling block reproduction that I put MVA front-site-with-bublle and Soule Style rear site on.
And I did exactly what Ranch 13 said to do ... I called them (there is also an email contact us on their website). The people there were quite knowledgeable about Pedersolis and the only thing they needed was the center-to-center measurements of the tang screws .... if I remember correctly it was about 2 1/4" on mine ... and then I sent them the Allen screws on my tang so they knew what TPI size to send me .... I believe Pedersoli uses several different sizes ...
Here is a pic of mine with the MVA sites on board:
Here is their website; at the top of the homepage is a Contact link the brings up an email address, ph# and snail mail address:http://www.montanavintagearms.com/