Flex Discs
 

If you have a 10-12 genesis you may want to watch for those going to hell on you. Being rubber and exposed to water, etc they seem to be falling apart. I got mine as a precaution while changing the clutch after seeing many issues with them. Try to order them from hyundai? Nope. They will sell you the entire drive-shaft.



https://www.powertrainindustries.com/story/GAH04-005



Paid just under 150 for both and received them the next day. Reports on install says they work perfect and are even stamped with the same part number found on the stock ones. It seems the stock should be coming from somewhere else, but if it works its much better than getting already worn out discs or having to buy an entire driveshaft.