I looked on Grizzly's website and the dust collection door is still available, part P1023004 for $15. The dust collector hose connector that screws to the door can be picked up from Rockler or Woodcraft. If you're talking about the motor cover, then you're right as that has been discontinued. I ended up ordering an aftermarket plastic motor cover for a Delta table saw for around $70. You can find these on eBay. I had to do only minor modifications to the cover for it to fit the G1023. Specifically, you have to mortise a couple holes in the cover to account for the metal tabs the Grizzly motor cover connected to. I picked up a butterfly vent from an RV store and mounted it to the motor cover to adjust the airflow into the saw. Probably didn't need to do this, but I figured if the original motor cover had vent slots, I should probably have a vent as well.

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Dave