MK-II* Carrier trivia question

[Michael R.]

. . a few are kinda cheesy though.

Two framed openings within the engine ventilation screen of the MK-II. The round hole with brass grommet frame allows the rear hull drain seal assembly opening/closing rod to pass through. The MK-II* rear hull drain is unlike that found on the MK-I* series of three models of carriers.

Then there is that pesky rectangular shaped opening.