rebound

What lug nuts do these wheels take? I only have the photos to go off of, and doesn’t look like these are flanged lug nut wheels, looks like they’ll require the acorn style ones. Just curious if anyone running these wheels has any intel on the lug nuts they’ve got.

After a lot of research and confusion I bought myself two pairs of Koni HT Raid shocks. It will be over $1700 with shipping and tax. But I am confused. When I install these shocks, which rebounding setting should I opt for? and how do I do it?