sebjmatthews
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As jcolwell said, it's the Ring B(B), not to be confused with the Ring D(B), which is for the 'L' version. Note they both have '(B)' in their names, which just denotes that it is painted black, and makes searching for the actual B fitting tricky, especially if you shop for a third-party one as they often mix up the names. I recommend looking for a second hand official Canon unit.
Though, very few cameras will benefit from using a tripod collar with the 100mm, and in fact in some cases it can be structurally detrimental. Check how much your camera body weighs (including battery, cards, and any accessories you may have on it). If your camera weighs much over 600g (such as a 5D) then it's safer to attach tripods to the camera body rather than this lens; if it weighs much under 600g (such as a 1000D) then it's better to use the tripod collar on the lens. Basically, you always want to attach the tripod to whichever is heavier, so the lighter part is what's left hanging off the mount. The mounts of many lenses may look metal, but they're almost always just screwed into plastic, and the 'gold ring' 58mm filter family of mid-range USM lenses—like the 100mm f/2.8—are all built that way; if you hang a heavy camera body off the back of one of those lenses, the plastic threading is what has to take all the weight, and unsurprisingly it can end up bending out of shape.
If the weight is within +/- 100g then you can attach tripods to either and it shouldn't make any difference, the lens mount can definitely take 700g.
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