Does it have to be the exact same one? A Dave Brown galss filled mount would work. Just make a template of the blind nut holes from the firewall, mark them on the new mount and drill the holes. Viola!! Just make sure that the new mount has beams as long as the old ones. The engine prop flange has to be a certain distance from the firewall for the cowl to fit right (4 3/8" ?).

Oh, by the way, welcome to the forum if you are new!!!!