You'll be able to track them down, but it'll be hard/expensive to do so until the end of the season.
If you're talking ride-ability, I believe Alka, in that there's not enough of a difference in the highback to change the way you ride. Sure do look cool though.
If you want more a feeling in the heel AND a team highback, see if you can still find some Union Holdens. They'd fit the bill.