Some companies sell them in packs of 8 so you can buy split ratio *1.5 and 1.6* or whatever. I would have to say that because of less friction they would be better. Im not positive but I believe there are different types, self aligning and non- that may require some sort of guids to keep everything lined up. Someone else could tell you more about this, I have been looking into buying a set myself so this will be helpful.