Replacement Door chime/speakers

Looking to replace two door chime/speakers from a Broan Music/Intercom Model K1350 system installed in 1991. The dimension of the original panel is 6 1/2" x 4 1/2" in a cream off white color. The unit has an M&S 100-002 speaker I believe to be 3 1/2 " size. It is a 4 wire unit. The mounting receptacle box is 5 5/8" x 3 1/2" x 2 5/16" deep. Most importantly, the two screws to mount the panel are 5 3/8" on center apart. The original replacement part would be desireable, however, any upgrade unit would be fine as long as I am able to use the existing receptacle box which is set in brick and mortar. Please advise.

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