I don't know if they *came* with them, but they flew with them even when they didn't have anything hanging off them. These would be A8s and A9s, I believe. [edit: Probably F8s as well, they were A8s in most ways]
It could have been a fix called out by the manufacturer, or it could have been something that pilots figured out in the field, and it became widespread as a custom fix. I'm not sure on the specifics.