  We derive numerical tight-binding hopping parameters to describe
conduction-band dispersion in arbitrary orientational phases of $A_3$C$_{60}$.
The parameters are obtained by direct Fourier inversion of the spectra from
self-consistent electronic-structure calculations for K$_3$C$_{60}$ using the
local-density approximation, including the effects of orientational dependence.
Using the new parameters, we revisit several earlier investigations of the
orientational ordering in $A_3$C$_{60}$; some of the earlier results are
substantiated, while others are slightly modified.
