I bought one off ebay for my 1100 and the lid does not go down all the way proper, that's upsetting, I checked again with the old one and the lid closes just fine, boo is what I say..I'll stick with the oem one instead, it seems to fit perfectly...I don't think I got it from Z1 enterprises though.. they have good stuff there..
I used a K&N that also did not fit all the way down. I had to work on the lid a bit to get it to seal. I have since removed it from service and went back to OEM. PM me if you are interested in the filter. I also have the complete cleaing and oiling kit that goes with it.