With a low price like this, for such a high quality M6 Screw Washer, it really is not worth trying to reuse the original damaged and corroded part.
For other related parts, check out the online schematic for your model and ensure you order all the parts you need to complete your task perfectly.
An alternative screw of the same dimensions:
Renewing this part is a lot easier than reusing the old item, and will offer superior operational qualities. Add as many items as you wish to your shopping cart, new fasteners for example, and pay just one fixed price shipping cost.