Fibreglass and vibration don’t usually play very well together. It would have to be a pretty substantial fibreglass piece to withstand the road abuse thereby negating any weight savings. Given its proximity to the engine and the front suspension components, I wouldn’t give it a very long longevity expectation. Not to mention the stone impacts they’re bound to get. Stone impacts will cause chipping and hairline spiderweb cracks. There might be fiberglass versions out there, but I for one wouldn’t consider them.
Carbon fibre maybe, but you better have deep pockets.
