Since the new Kelty shelter is a "Co-Op Exclusive" I wouldn't be surprised if it's the "same" shelter, possibly made in the same factory. I called REI and the girl took a look at the shelter and she says there are little holes in the hubs so it's very possible that the old Alcove windwalls (which are still for sale) might fit this new shelter!
My recommendation is to call Kelty and ask about replacement hubs for this shelter. They call these things "shade shelters" because they're not really designed to withstand heavy weather so even if there's a warranty, it might not cover "improper use."
When all four corner hubs on our Alcove failed during a microburst (bad pitch on my part - totally taco'd) a couple of years ago, I contacted REI and they referred me to their third party vendor (
TentPole Technologies — Tent Pole Repair and Replacement Specialist). I can't remember what the price was for an individual corner hub, but it would have been around $80 (including shipping) to replace all four.
I was able to return our mangled Alcove for a store credit but I think that's only because I had a newbie at the return counter. It's a great little shelter, as so many have said before - we used a tarp and then an easy-up for a while, but when I saw the Alcove was on clearance, I decided to get another one (plus windwalls) with the idea that if they changed the hub material, I could switch it out for a new one - doesn't look like they did, but we'll keep it anyway - it packs up a lot smaller than our easy-up and I can put it up by myself.
I learned my lesson about guying it out properly, even if I don't think I need to.