If it's like the ones on my CBR, it's springy steel wire bent in a very weird shape to hold the bulb base against the mount. Knowing Honda, they should all be the same. Look at some other Honda microfiche and see if you can find it.
By the way, my CBR used Honda's proprietary 45/45 watt H4 bulbs with the two lower tabs at a different angle than standard H4 bulbs. I got standard 55/60 watt H4 bulbs and snipped off the lower tabs. The top tab centers the bulb and the springy wire holds it in.
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