This set is designed to take the Hasegawa 1/48 TA-4F/J kit and convert it into an OA-4M. This is the external set only. We also have set 48146 OA-4M cockpit which is a dop fit replacement set for the kit as well. You can also add pylons (48133), 300 Gallon Tanks (48126), the intake bell and fan (48129) crew ladder (48168), 400 gallon tank (48194), Seamless Exhaust (48256) as well as a slew of weapons and pods from Flightline Resin. Also be sure to grab the Furball decal sheet which has a grip of OA-4Ms to choose from!