[WRC] Monza Rally 2020

[Co-driven]

Right now it looks more like 3 days of massive rain.

Trying to make sense of the tire limits. After reading both the Fia WRC sporting regulations, the Monza Supplementary regulations and Bulletin n4 I still don't get how the number is limited.

The first two documents only mention the total number. But in bulletin n4 (from here https://www.acirallymonza.com/notice-board/?lang=en ) it says:
First choice 24
Second choice 12
Wet 12
Snow 8
Total 24.

If you pick Wet as first choice can you get more than 12? I guess they don't wear much in rain, but with all the handbrake turns on the circuit they might wear a bit?

Related question, how to find out which R5 is using what tires right now? (besides looking on stickers at SD/other pictures.)

You don't "pick your first or second choice". It's the choices that the tyres manufactures make. For example, Michelin's first choice is the Pilot Sport H5. Crews can use a maximum of 24 tyres of this model.

So, there is no way that teams can choose the "wet" tyres as their first choice. Only a maximum of 12 tyres can be used throughout the whole rally.

Also problem of wet tyres is not down only to wear. They work better in a lower temperature, so if it's too dry temperature will build up too fast and "tyres will start to move a lot".