Is the bike still under warranty. I know giving a bike in for warranty service especially for something like that is effen annoying. That being said. Maybe the just order a new set of friction pins and rubber grommets if thats what the friction pins go into. And in the meantime try sliding something in between the plastic and the rear tail light to sort of thicken any weak spots. Maybe take some thick tape and fold it so the sticky part isnt showing and slide that in between the plastic and rear tail light. Just do it so you cant see the tape. And wait till the other parts come in. Or I could be talking out of my ass and have no idea what Im saying. I dont have a V4. I have a 1299. But hopefully my advice works