Sky Flash was based on the AIM-7 Sparrow, so could you skootch it and use it instead? There are several sources, the oldest that comes to mind is the Hasegawa Weapon Set:
https://www.1999.co.jp/eng/10000501
But Eduard and others have since put out alternatives.
Heh-heh, I had misread your thread title and originally thought you were asking for 1/48 Skybolt missiles!
https://en.wikipedia.org/wiki/GAM-87_Skybolt