Except as otherwise provided in this part, the following provisions of the Commission's rules relating to reparations contained in part 12 of this chapter apply to this part: Sec. 12.3 (Business address; hours); Sec. 12.5 (Computation of time); Sec. 12.6 (Extensions of time; adjournments; postponements); Sec. 12.7 (Ex parte communications); and Sec. 12.12 (Signature).