Patrick, not quite following you here. Does the T73 have the parallelogram miter fence? If so it should do everything to support the workpiece and get the end block close to the blade. On the 72 there is a pin to release to do this. Also the 72 has a battery for the digital that is charged by a cord from the machine. The T73 might be different.
And the Miter X does not need a bracket. Its built into the unit for mounting. Post a picture of the 73.