They're almost identical to the one's for the OEM KTM bars. The don't obscure the vent at all. It's a new design and I actually just got confirmation that the design fit. I don't have any in stock right now, but I can give you a heads up in a week or so when I get some finished.
I could use some good pictures of my SW Motech bags though. I'd be happy to send someone a few nice freebies in exchange for the pictures.