Carver made basically two faceplate sizes:
17" like my older office system (M-200t, TX-2, C-2, DTL-50)
and 19" like my son's system (M-1.0t, CT-Seven, DTL-200MKII)
They also made 19" adapter plates for the older 17" components
and bolt-on rack ears for the 17" M-500(t), TX-11, MXR-series receivers, etc.