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The flex disc is usually but not always just up front (there are a few that have them in the back). The flex disc has the sections around the bolts that absorb vibration. The "solid" ones like this are called a rubber coupler. I've seen the rear ones crack like this or have pieces of reinforcement (like a heavy string) shredding out to the sides.
The flex disc is a wear item and should be inspected occasionally. The rubber coupler can fail, so good to keep an eye on it, but is intended to last the life of the car, unlike the flex disc. Description is wrong in the part number that was quoted, nothing new, the parts dept does use different sounding descriptions for things, and as far as that goes everyone uses different terminology for things, as long as everyone understands what's being discussed, then we're communicating, right? But a flex disc is a very specific thing, usually you only have 1 flex disc and it's up on the transmission side.
Gilly
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