I know one thing, mine were a lot more than Robert's. I got mine from the Chevy dealer. Put it this way, I could have bought them both at Autozone for what I paid for one at the dealer.
Mine were $118.00 each.
I know you get what you pay for but damn. I almost didn't buy them. I started thinking, hey, I plan on keeping this truck for a very long time. Don't start scrimping on it now.
This was wholesale, list was a whopping $169.00. I think they had gold parts inside.