It's been a couple of years but I found a Mopar performance double roller set for a /6 on eBay.
I also bought the last double roller set that rock auto had around that time. Had to buy as 3 seperate components all the same brand as each other, they were some of their "wholesale closeouts". I believe that as seperate components the chain itself fits many actually. Big block Mopar of course but I believe also big block shivvy too.