I don't know if the LCA's you're looking at are shorter. All of the ones I was looking at had the comment about be able to fit wider wheels.
I didn't have to cut the LCA's at all, just the bolts that were "fozen" into the bushing. In fact I took them to a shop to have the old bushings pressed out and the new ones pressed in. Only cost me $20. Having done the removal with a drill, hammer, socket and hacksaw before for the poly inserts, I felt the $20 was well worth it. If the aluminum arms you're looking at are the correct length, then $100 for the pair is cheaper than buying the bushings seperate and having them pressed in. I'm not even sure about the difference in length whether or not it would effect anything. I run 13" wheels since I didn't like the 15" ride, plus most of my 15" wheels are alittle bent causing a shimmy that drives me nuts.

Which of the bolts are you having trouble with? Inside, middle or outside? Maybe I misunderstood the location.