Who has Dr. Diff 8 3/4 rear discs?

I just did some looking, I bought the 11.25" rdb kit. Website pic (dr diff) clearly shows drum as parking brake in 11.25" kit.
Don't know the other as mine is a 67 Barracuda with 8 3/4.
I am getting 11.75 fdb kit , to finish up my suspension and get on to finishing my car!!!