Help Finding Battery Cover for MC-54-250

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I have a 2007 JMStar 250, the same as the Roketa MC-54-250, which I've been bringing back to life.

The prior owner let some gas sit in it too long, tried to put an automotive head unit in and killed the battery, then let it sit for four more years, lost the keys, and lost the title.

Anyway, I emptied the tank, re-keyed the bike, replaced the battery, and she now runs quite nicely. I am noticing now that the strap for the battery and the plastic cover for the battery are missing, and none of the standard parts sites seem to sell these items.

Does anyone have any tips on finding these parts?