Hi Sheppie62!
Been sorta under the weather with my back
The hatch is located on the aft face of the galley of or Mac26X as you had already figured out.
We used the same part number hatch as we did for the fuel locker cubby top access.
The hatches have been working nicely in all locations. Good value product. The “latch” force is adjustable by loosening screws and sliding the roller plates in toward the frame (stronger latching) or away from the frame (weaker latch) which is nice to taylor the strength of the latch to the need.
Hope this helps. Sorry for the delay.