I'm 8.5D. No problems getting myself added to the Tanker pre-order. For reference, here is what I wrote in my email to them:
"I'd like to put down a deposit for the next run of Tanker boots you're doing. Can I pay via PayPal? If so, please send the request to this email address"
I put in for 12.5 D...received the paypal invoice so believe I am good to go.