This model isn't in the Metcal catalog I have, so I can't tell you specifically what tips it uses. Your best bet is to look at the tips for the model number when you get it. The current standard tips are the STTC series for general soldering/rework, and SMTC for specialized tips for SMD work. (For the 500-MX iron that is currently in the catalog.) This sounds like it might be the MX-500 predecessor. Looks like you got a pretty good deal. (The MX-500 is $750 or thereabouts, but is also a dual-head iron). The model number sounds like it may use the STTC tips. If so, there are plenty to choose from. I have at least a dozen tips for my MX-500, in various sizes and temps.
There is also an SP200 iron that uses SSC series tips. This is a lower cost, single control version of the MX-500. The SSC tips are not interchangeable with the STTC or SMTC tips.
Hope this helps.
Cheers,
bg