$800 is extremely cheap. most go for over $1200 and they are from running and beat on / raced bikes w/o being rebuilt.
If you go on any oem part supplier website and look up the frame model, it will tell you by comparing the part#. The only diff will be that the earlier ones were green and the later ones are silver.
I did some research from 98 to 04. All the frames are the same but the part #'s differ. On some years the 32160 is the frame and 32160-A is the rear subframe. The other years, it reverses the #'s. But the mounting points are the same. At least from what I can tell.
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