Banjomikez has them up on his eBay store.
DiMarzio Super Distortion 7 String Bridge Humbucker Black w Black Poles DP 712 | eBay
As someone that loves his '70s Super Distortion, I love this. It's described as a low end-focused pickup, but mine is surprisingly tight and bright, so I'm hoping this sound similar.
I'm actually surprised it's taken this long...