Ah, thanks SO much for posting the images... now I know exactly what to get (while I have several "hardware" type stores in my nabe, I have found it difficult to find what I'm looking for because none are like such stores used to be and none have anyone who speaks a whole lot of English... a few weeks ago I want to 2 of them looking for a 6mm allen wrench and most looked blank until I pointed out what an allen wrench was... one of them proceeded to shows me SAE sized ones). So knowing visually what I'm looking for is of GREAT help.
Ah, just noticed you did provide a link to such bits on Amazon... but they don't come FROM them and are part oof this thing where the cost to ship is way above the actual cost and more than the cost of the product (5 bucks to buy, almost 7 to ship).