I tried to buy Wetokole covers a few weeks ago, but so far they only offer the front seats. I got a call a few days after placing my order saying that they dont have the 2nd row bench covers even though they show it being available on their site.Actual new upholstery or just covers?
To reupholster seats, it's hard to bet Katzkin. They're the industry standard in aftermarket leather.
I'm unaware of any custom fit seat covers for the Ascent - perhaps try Wet Okole.