In the MIDI world everything is 7bits, those MSB/LSB parts are always 7bits and create a 14bit value as per the MIDI specification.
There are some devices that use 8bit values, but those are always split into 2 MIDI bytes. Usually one is 7bit and one is 1bit. Sometimes (like the DSI Evolver) those are split into 2 4bit MIDI bytes (there is a special SysEx token for this ls/ms 4bit split and LS/MS 7bit split)