There are 2 different dimensions for standard rails, Freeland and Anshutz. Freeland rails usually only fit Freeland accessories but Anshutz rails fit both Freeland and Anshutz accessories. Either way you may have to fit the rail either by macining the stock and/or the rail. If the rail you get is smaller than the slot you already have in the stock you can fix this with some bedding compound in the slot.
Paul Reiben from Range Sports Unlimited in Kamloops BC sells Anshutz dimension rail.
