Elite Direto Thru Axle Compatibility

I’m confused as to what I need to do to make my Direto 142x12 thru axle compatible. I didn’t keep the box of adapters that came with my trainer.

I found a link to the spare parts that I need, but it literally doesn’t give an option to use a US shipping address.

Also, what does this do? Do I need it?

https://www.elite-it.com/en/products/home-trainers/trainers-accessories/thru-axle-adapter