Already have a Cyberbeast. Can I reserve a range extender after the purchase?

[Nisch]

Edit: Just found another thread about this. My apologies. It didn't come up before.

I did not choose the option when I ordered my truck back in June. I received my truck in August. I'm now interested in getting the range extender (whenever it actually comes out), but I can't see any options for reserving one after the initial offer.

Anyone have any insight how to do this after taking delivery of a truck?

Thanks!

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