I own an old TIE system. It is an ULTRACOM AT (UMT-64) model. I have 2 models of telephone sets: UAT-64E (P/N 10864E) and UAT-64 (P/N 10864). I need a Printed Circuit Board for them. I am not sure what the part number is, it shows the following identification: C-ANU-B and under this ID it reads: MH-2964(2).

Is this description sufficient to know what I need? Where can I buy this kind of parts?