Only 3 is hard to do, so I'm listing 3 existing and 3 gone but not forgotten.

Existing:
1 - Point Bonita - CA
2 - Harbour of Refuge - DE
3 - Miah Maull Shoal - NJ
Close 4th - Duluth South Breakwater Outer & North Breakwater (could be done as a set like the Panama set)

GBNF:
1 - Bergen Point Light - NJ
2 - Bug Light - Boston Harbor
3 - Minnesota Point
Close 4th - Tuckers Island (original, not the existing replica)

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Lighthouse Loon