Go to the support center and file a ticket, asking them to add it to your account. Name.com is pretty responsive this way. They're not discounted, still about $85 each for the matching gLTD's.
They did mine for me in less than an hour (it may have been quicker, I only checked an hour after submitting the ticket and it was already done).
Name.com is usually right on the ball with support.
https://www.name.com/contact