The best isn't an insert...it's a replacement which eliminates the voids altogether:https://store.034motorsport.com/dogbone-mount-pair-density-line-mk5-mk6-volkswagen-8j-8p-audi.htmlhttps://store.034motorsport.com/blog/034motorsport-density-line-dogbone-mount-pair-install-mkvmkvi-volkswagen-8j8p-audi/
What insert do I need for my 2005 gti apparently there’s 2