Need Alternator and Belt for Crusader 60L

I have 6.0L Crusaders in my 20

I have 6.0L Crusaders in my 2004 Pursuit 3100. Cranked the port engine today and the serpentine belt broke. I looked around and tried to spin the alternator by had and it wouldn't budge. So I suspect that is the problem.
Now I need a new alternator and belt. The alternator is a Delco 70 amp and the part number in the Crusader manual is RA097007C. The belt has marked on it Gates K060908 on it.
Where is a good place to find replacement parts for these. I would prefer someplace local like West Marine or one of the autoparts stores.

Any suggestions?

take the old one with you and

take the old one with you and go to your local auto parts store that carries Gate...they should be able to match it up.

I'd check the rest of the pulleys on the loop to make sure they are free.

Take the alternator to an alternator repair shop. Tell them its marine and ask them to recondition it. Shouldn't be more than a day's wait.