In communicating with GSXS-NH earlier about his exhaust hanger, he turned me on to a company out of Germany that makes an exhaust hanger for our bike (other than Yoshimura).
I'm glad I checked with the company before ordering, as the one indicated in the link is 7", but comes up short (just like the Yoshimura) requiring an additional bracket to take up the slack. (Twag4 complained about this issue in a separate thread).
A 9" version is also offered for the same GSXR 2009-2011 year model, so if you want an exhaust hanger that fits your aftermarket Slip-on with no passenger pegs, this is a perfect fit, like OEM! Send a message to the company and specify 9". Delivery was fast. Excellent quality, aluminum, powder coated black.
In the pics attached, the 9" German hanger, the Yosh hanger with extra bracket, as well as a pic showing the perfect clearance to the swing arm.
EDIT: I am so pissed the pics come out sideways, I rotate and save them to my desk top upright, but here they come out sideways again!