Eduard makes a PE set for the Trumpeter1/48 HH-65 Dolphin. #48455 HH-65A
All you'll need is a sharp pair of scissors, and some super glue.
You'll also want to get the Cobra Company Resin Interior conversion and Fireball Modelworks Decals.
Fireball also has a resin conversion to make a USCG HH-65C model, which includes the corrected tail rotor assembly.
Fireball also has a corrected main rotor blade set.
Eduard
http://www.eduard.cz/
Fireball Modelworks
http://webpages.charter.net/osborn82/
Cobra Company
http://www.cobracompany.com/
Good Luck,
Pete brown