wheel adapter

Yes, that’s the adapter to go from 5x4” to 5x4.5”.

But- that’s a cast adaptor. I’ve seen that type crack on more than one occasion. Adaptors are fine, but I only use ones machined from billet.

They’re also 1” thick. So, the backspace on your new wheels need to be 1” more than your current wheels if you want them to fit the same. Stock wheels don’t usually work with a 1” adapter because of the backspace, and if you’re looking at 15” rims you’ll probably need a custom wheel to get enough backspace to run a decent size tire.