Seems like you're putting a lot of effort into something as simple as figuring out how to mount a part when you can easily either go check under the car you're mounting it on to see which way it goes, if possible, or just Google images of rear flex disc orientation. Either way, several hours have already gone by and you don't seem any closer to the answer of your original question of mounting orientation.....unless you've now deviated from that and just want to know about the business affairs of some manufacturer
. At any rate, the photo you posted appears to be the disc that can be mounted either way. On the discs that are unidirectional, the mounting holes are offset and the front of the disc is stamped to inform you of which way the disc should face.