Well as the title says I’m looking for a Lyman R25 site for my Remington model 25 In 25-20.  I believe Marbles made them as well.  If I remember correctly I have a R 12 for the model 12 22LR up in the drawer, but the hole spacing is just a bit smaller.  
I’m in the hopes that one of this bunch has one in a box or drawer that you might rummage through and find that forgotten site and would part with it.  
Thanks John