[91Bravo]

I have Winchester Model 52B I'm using for 4 position smallbore (50 foot). It has individual threaded holes for a front swivel, rather than the adjustable sliding rail. Anyone know where I can find a correct swivel or hand stop for the model I have?

http://www.gunboards.com/forums/uploaded/91Bravo/20061125221335_100_0456_00.jpg