Just wanted to follow up. I'm pretty confident the length of the spacer tube has been contributing to my bearing failures. I attached a pic comparing the spacer tube from Dez's OEM Carrier (Left) vs. the one out of the Niche carrier(Right). According to Cuervo when everything is installed the tolerance should be around 20 Thousandths.
I am using All Balls bearings with the OEM spacer tube in a Niche Carrier. Also going to rebuild Dez's OEM Carrier and keep as a backup.
06' 700 SE