The plastic isn't ribbed, it's softer so it doesn't break that easily. The lamp fits perfectly into the niche. When you attach the ring to hold the headlight, the holes don't line up perfectly (not that big of a problem). The biggest problem is that the ring doesn't fit the light exactly because the clamps you screw into aren't as deep as the factory clamps. I solved this problem by putting some thin strips of rubber behind the lantern to push it out a bit. Again, no end of the world at this price.
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