The air intake
All Tigers, apart from the prototype, had a ventilation slot near the front of the engine hatch. This slot needed to be protected in combat, and sealed up for submersion. The tank's designers invented a cover for it that served both purposes.
This is the cover. It is box-shaped, but with two of its corners tapered. It has walls and it is open on one side only.
To seal the tank for submersion you unbolt this cover, turn it upside down, and then bolt it on again. Its flat top surface, in conjunction with a built-in rubber strip, then forms a seal around the slot.
After only about a dozen Tigers were built, the "Feifel" filter system was introduced. It came with a large duct that attached to the slot. This cover was no longer provided for Tigers; instead, they got a simple flat rectangle that could seal the hole if needed.
The Feifel system was deleted much later, so the original cover came back into use.
The kit's intake
This kit provides alternative parts for the intake. Unfortunately neither of them is correct.
Part M33 is the sealing plate that comes with the Feifel system. This "Initial" Tiger does not have the Feifel system, so the tank would never have been issued with this item.
Part M34 resembles the actual cover, but it's open on all four sides, and it doesn't have two tapered corners like the real cover.
A correct part for your build can be found in "mid" and "late" Tiger kits from all manufacturers. Unfortunately it is not an optional part, so they cannot spare it.