Near clipping plane is at 'n' units distance. Far clipping plane is at 'f' units from origin. z-axis is pointing right screen, y-axis pointing up and x-axis pointing outside the screen. Assuming aspect ratio of 1.
Doing some basic trig you can get the width and height of the near and far plane, of the near plane they will be 2* tan(theta/2) * n and the far plane will be 2* tan(theta/2) * f
So the 8 values will be
(-n, n*tan(theta/2), n*tan(theta/2)),
(-n, -n*tan(theta/2), n*tan(theta/2)),
(-n, n*tan(theta/2), -n*tan(theta/2)),
(-n, -n*tan(theta/2), -n*tan(theta/2)),
(-f, f*tan(theta/2), f*tan(theta/2)),
(-f, -f*tan(theta/2), f*tan(theta/2)),
(-f, f*tan(theta/2), -f*tan(theta/2)),
(-f, -f*tan(theta/2), -f*tan(theta/2))