Also, the 250 and 500 did not have the same tires. The Bridgestones were close, but not exact. I'm at work late right now, but I can get exact tire models for you if I think about it tomorrow. I have a mint stock '87 250 at home with Bridgestones, and two mint stock '88 zillas at home, one with the Dunlops (purchased new in MO), the other with the Bridgestones (purchased new in CA).
The Zilla Dunlop tires are the same as what Toydoc posted. Zoom in closely to this pic to see both sets of factory tires on two mint '88 zillas. You can see the Dunlops pretty good. Pretty sure '87 was the same.
Here is a close up of the factory Bridgestones.
