Doh!..... Ok, gotcha. The diffs are the same GSX or TSI AWD. BUT some came with LSD rear end (GSX and TSI) and some came without. I don't know if that was an option or what. On the one with LSD you will see a plate on the back of the diff that actually has LSD stamped on it. Now there is also the difference of 3 bolt and 4 bolt. The 4 bolt is obviously stronger. I believe they came in the 93 and 94 cars. The biggest problem with identification now is that you can't be sure of what is in there without looking. These rear ends are often swapped out. Though people don't generally swap TO the 3 bolt, they may have, so they could steal the original 4 bolt off the car. It appears from the ad that they have put in a LSD. Wether or not it is a 4 bolt, I can't say.

MB