Yeah I am one of many that filed the U-groove with much success. Drilling the bars is just way too much work and you need to know exactly where the components are going. I think you want to find one that looks like this:
(picture is a 1/4 of the way down): http://www.totalmotorcycle.com/BBS/view ... 4bd2431fc3
(picture is a 1/4 of the way down): http://www.totalmotorcycle.com/BBS/view ... 4bd2431fc3