Hmmm.....DS parking brakes are somwhat optional, they just mount on the rear of a trans, I doubt if the trans maker even makes them. The trick would be to find or machine the spacer/mount that it mounts to then you could mount it on anything (with DS alterations). That spacer usually holds the rear seal and spedo gear too. Most all trucks had them untill the 80s when they started using the gerling style hydraulic emergency brakes on the rear axle on some (Fords). I would guess the trucks with rear disc still have them. You could go hunting at any medium truck/school bus salvage yard for ideas. You could always use the Ozark method, a couple sticks of firewood by your tire, that works real nice.