Ultima High Noon Leather Saddle, 13" wide, about $50 plus springs and shipping from Jireh Cycles.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1214523580The first two pics are me and the wife on the stock saddle. As you can see, the wife is extremely cramped. (Her fault for having a 36" inseam!)
First try mounting the saddle. Just a bar across the stock mounts to take the springs and a front mount to make the seat level. 'Way too high and back for me, but as you can see, made for a nice comfy position for the wife.