That is my truck.. There is a link to it in the Under Construction section on this forum. Here is is..
http://www.streetsource.com/forum/topic.aspx?topic_id=104068 The reason for the sectioning of the lower links is like Cheeks said the bars are 2x3 square tube so to make them look right they were sectioned so that they fit the bushings. Just one of those things to make it look different yet still have a little custom flavor to it. The bars are also tapered on different sides for each taper.. To answer your question though.. Running the bags where we did did not require the bar ends to be tapered. It was a cosmetic thing.