12" Z-bars, love them and get lots of compliments. These are a lot more comfortable than the mini-apes for me. 08 and later Street Bobs you'll need to drop the forks a bit because of the integrated risers.
Here are my 14" apes on my 2006 Street Bob. I am very happy with mine. I like the way it rides and looks. It does have a different feel, a lot of leverage I guess, I have to be careful not to over do it on counter steering. You will get used to what ever your new set up is.
These are custom built 12" internally wired. They were very comfortable for me.
They will be for sale very soon. Decided to go with T-bars for the looks.
I just ordered a set of 8 inch rise Z bars...claim to be 12.5 inch pullback..I will play with them to see if they will work for me. I have 11 inch pullback now. I don't need more.