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The original T3's horns -- which I think are the same as the T's -- are a pair of 9.5cm Voxbells, mounted on springy steel brackets. They have mounting bolts centered on their backs. So they are different from the one you asked about in a couple of respects. Another feature of the originals is that they have two wires each terminals for positive and negative wires, instead of grounding through the mount. But as was said, you can make any horn work.I think the springy mounting helps the horns sound so loudly. Those Voxbells are pretty impressive. I decided to keep them when I added a Nautilus airhorn under the tank, to make a variable-loudness system.
I'll probably spring for the voxbells at a later time, I like the look of them and they're original. Can't say I've ever heard them though