‘06 TJ Rubicon 6-speed cardan joint rebuild calls for two non-grease-able Dana Spicer 5-1330x u-joints. Denny’s Driveshafts is out of stock. Amazon seems to have only one. Summit has plenty of them, but describes them as “light duty”. Am I missing something or are there actually two different duty levels for the Dana Spicer 5-1330x?