If the plug on your Mars Rover's speaker does not match the socket it is meant to go into, stop at that step and tell us — do not force it, and do not modify the plug.
There is a small part that solves it — the Speaker Fix connector — and we send it free of charge. There is nothing to send back.
What to do:
Message us here, or email [email protected], with your order number — a photo of the plug and socket helps, but is not required
Confirm the delivery address for the part, and a phone number in case the courier needs it
Carry on with the rest of the build in the meantime — nothing else depends on the speaker being connected
How replacement parts travel and where the tracking arrives is covered in My replacement part has been approved. What happens next?