We use a random-phase-approximation expression of an interacting electron model with a tight-binding energy dispersion to describe the spin susceptibility χ(Q) of the A1C60 systems. By slightly varying the band-filling kF, the anisotropy of the electron overlaps t∥/t⊥ and/or the interaction strength λ we are able to describe the electronic and magnetic properties of Rb1C60 as well as K1C60 by a 3D model. The results are compared with measurements from the literature.