Register here

http://club-ottomobile.com/

Then when its all confirmed, log in, click pre-order, select how many of each you want (max 2) & confirm. You get an email confirming it then another requesting payment to be sent a few days later. Pay via paypal & wait till they come, usually mid - end of the month of release.

As it write this, the RS Turbo is still on the pre-order page so there are some left. When its released, they do go into their web shop if there are any left. Ive not used that part before.