Yeah, if they're fiberglass, then they're not factory. The factory parts are plastic and all of the aftermarket humps I've seen are fiberglass. No big deal though, you can still mount them okay. I got some factory humps that were brand new but did not include the mounting hardware - so no spinlocks. I went cheap and modified some $8 straps from Walmart with some custom brackets to hold them. They've held up just fine at highway speeds with extended driving. So, if done right I don't see why the aftermarket humps couldn't mount well with straps too...
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