Which m2 adapter is right to buy?

Question

motherboards

Hello. Gigabyte Z490 UD motherboard available. It has 2 slots for m2, which are already occupied.
But I read that you can purchase an adapter that plugs into the pci connector.
I am completely ignorant of such matters.
3 questions arose:
1) The characteristics of the board indicate that there are no PCI-E x4 slots, but I saw a connector on the motherboard itself that says "PCIEx4"
2) Which adapter to buy so that there is a connector on my motherboard for this adapter. For example, on the site dns (Moscow).
3) How much will the adapter affect the speed of the m2?

Answer 1

Any of these will do: https://www.dns-shop.ru/catalog/8a9ddfba20724e77/s...