1:72 Nuclear Weapons

Hey, E! Firstly, welcome to the forums!
Okay, i remembered that hasegawa had quite an offering of 1/72nd scale ordinance. They were called U.S. Aircraft Weapons I through U.S. Aircraft Weapons IV, i think. I'm not too sure if they have the bomb you're looking for... I can't load the pics, so you'll just have to go to this site:
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXP062&P=FR
Is the bomb you're looking for here? i can't tell them apart anymore! (maybe the silver ones?) This is from the Hasegawa 1/72 US Aircraft Weapons I.

Well, they may not have your bomb, but they certainly have some accesories you might like:

Hasegawa 1/72 US Aircraft Weapon Loading Set


Hasegawa 1/72 US Aerospace Ground Equipment Set

Was this what you were looking for? I hope this was of some help to you!