Meng King Tiger - the options!

Hi there team, I am currently working on Meng’s King Tiger kit (TS-031).

This is a kit with a lot of positives. It’s also a kit with a lot of options… but no guidance whatsoever on choosing the options! like what option represents which period.

See below snapshot from the instructions, can anyone shed some light on the two options circled red / green? Is this a change in production with a certain date of change implementation? or maybe something more complicated like different factories providing the different parts?!

Thanks in advance!

I believe F35 is a cover for deep water fording? Not time specific.

F-53 is a waterproof cover, seldom seen in service.

Thanks Dan, Gerald. Now that you say that it makes sense, as it looks like part F53 could slip over F11. Presumably if one was to use the waterproof cover there would be other waterproofing features used in conjunction on other areas / parts of the vehicle?

I believe F11 is the cover for the turret fan housing. F53 as mentioned above is the water proof cover.