I am not a fan of poly bushings - they do not rotate well and end up becoming noisy unless you lubricate them often. I would either use rubber or a Delrin type of sealed bushing.

 

I know this is an older thread and i am new to the forums but i am looking to get some POLYs for a customers 2015 Panamera GTS AWD and i understand that they are not readily available. But what i would like to do is a cross reference between other Porsche models and see if any of them match up or if could get the dimensions of the bushing and either get some made or maybe find other models with the same sizes.