Futaba and JR/Hitec leads are not interchangeable. Futaba have a tab, JR/Hitec have a bevel. Personally, I am a JR/Hitec person. When I buy generic male housings (w/ female connectors), I just use a hobby knife to cut a bevel. There is no easy way to add a tab.
You also need to consider the type of retention device used. Some are barb, some indent and at least two types of indent. I prefer the indent, which is typical of JR/Hitec.