Any industrial supply or gunsmith supply will have them mine are about 30 years old [I used to have a gun and archery shop] which I sold many years ago when I retired.
If you decied to do the way a lot of the people here do and try to put them back in the same spot mark the screws so you get them back in the same hole switching them around by accident can screw you up[ no pun intended. Personally because of give and wear I believe that using a screw driver inch pound gage is much more reliable. Lee