Uncle Mikes Quick Detach Studs
Uncle Mike's Sling Swivel Screws is a set of one each of 1/2" wood screw forend base and 3/4" rear wood screw base with white spacers only. You get the long stud for the rear stock and short stud for the front.
These will also work on your rear synthetic stock if you have a hole there. Just screw the long one in that hole and the short one will work also if you need it for a second gun.