Become a Full Member and get the official Linkage Tour and the official Starting Aid. This information alone will pay for your membership
Most probably. For a USD$100, plus and hours work, you can’t go wrong. You can always change them back and take them back if you don’t like them.
No adaptor required. It was a straight fit. Plug and play. See photo.
The Narva lights look like the same items, maybe just branded Holley here in the USA