ok im assuming you want a spyder n-bolt?
well you may want to get ahold of dalum about this.
He has the ones at the top (which i belive are 8/32 threading). 8/32 is a stock spyder bolt thread. then he has the ones at the bottom "Bandit Spyder Rear Cocking without Cocking Rod" or the ones with rods. Thses have 10/32 threading which fit autococker cockin rods. if u are using your snap-back system then find out the threading and order one to your prefrence.
BUT HE MAY HAVE THEM ALL AT 10/32 now so find out the snap-backs threading (if u are using it which u should cuz it owns) and if it is 8/32 then get ahold of him.