GM differential part numbers needed

[JS77]

Thanks Joe for the parts list. So, I was talking to a Yukon rep about my intentions and they discouraged me using the ring spacer. I have a speedboat we use during the summer and living in the Pacific Northwest with the hills and mountains, he was pushing for a new carrier. Says that with the tires I have that I would be at the limit he would feel comfortable with the spacer. Maybe he was trying to sell me something but I’v learned that it’s usually better to pay more the first time then have to do it twice.

[Gagliano7]

I can not see how a solid spacer could make it any weaker. But if there carrier is stronger than stock then that will be a good choice. How much is the carrier?