So, when I bought my 1996 Max IV, it was in pieces. Actually, worse than pieces. One of the previous owners had made it into a hydraulic machine. Then, the owner before me took all of that out. What I bought was a pile of random parts, and an extra Max II tub (original style wheels). It came with a "rebuilt" T-20, which I have since figured out wasn't. My question is, Now can I tell if this is an older style (pre-thrush washer) unit before opening it up. Will I need different internal parts depending on the age of the T20? Does the code stamped on the info plate, which is missing all its writing, tell anything?

The code is 2713.

Thanks
Kevin