That one doesn't have a small pin over the spring? In other words, it slides in grooves, and then the screw holds it? There are two models of these, one with the ears, and one without. The one without has a small pin over it, and it has the extra safety spring cut into it.
Sorry, been a while but to answer you, all 3 of those are incorrect. The Browning spring looks like the 3rd link but is actually 1/4 inch longer than the Remington one shown. I have been unable to find the correct Browning spring.
No, I know the spring you're speaking of, but they don't have it listed at Numrich. That's why I put the link for the Remington 11 there. You might give them a call, because I know they made many Auto-5's the way your's is, as I've worked on them. I don't know why Numrich doesn't show it, unless they're out, but they generally don't remove a photo and listing for that.