The back cover changed awhile back on the TFD model to a full length cover with a 90 degree bend that covers the top of the outputs. This cover only allows bottom entry of the cables. Due to customer requests the cover is in the process of getting replaced (ECO MEX5243) with a cover (P/N 143149) that allows top and bottom entry of cables.  If providing the new cover as a field replacement, the customer will also need to use different standoffs as well (Qty 2 of P/N 143150).