Aloha TR,
How many are you? Do you need to rent gear? What is the experience level of your buddy(ies)? Lahaina Roadstead is an anchor location, not a docking; is 7 AM the earliest tender? Do you have any hopes as far as what kind of diving you would like to do?
Extended Horizons has the
Carthaginian wreck scheduled for Thursdays; it is a 12:30 PM departure from Mala Ramp (just over a mile north of Lahaina Harbor).
Lahaina, HI - Google Maps
Looking at the map linked above, Lahaina Harbor is where the Best Western Pioneer Inn is located and Mala Ramp is near where the Old Lahaina Luau is located. Best to book that trip in advance, asap, as the trip only goes when enough divers sign up, and with your party booked a trip may book easier. If not enough divers sign up for the wreck, Extended would still probably be able to take you shore diving (conditions permitting), although your transportation to and fro the dive site(s) is perhaps taxis.