It doesn't sound like sway bar links are the problem but they are easy to check, not that costly and easy to replace. The sway bar is restricting suspension roll so if a link is "broken" there will be more body roll which will result in more load on the wheel on the outside of a turn and less load on the wheel on the inside. 50 +- 3 mph could be just the load or unload point to cause your shimmy. CV joints should make a clicking or clunking noise if they are bad. Jack up your X5, put the transmission in park and see if you can turn the wheels forward and back. Those are two most common symtoms of a CV issue. I suppose it could be the combination you suggest but even then I would replace normal wear suspension parts before replacing CV joint. The tie rod ends are part of normal front suspension wear parts.

It doesn't sound like a wheel out of balance because it is only when turning left. I still would try that first just because it is cheap and the shimmy is at a narrow range of mph.

If that is not a cure I would complete the front suspension rebuild. if you do all that is left to replace you will save yourself the time it takes to tear it done twice and the one of the two alignments you will need.

If you are not sure of the parts you need you can see a suspension rebuild kit at ecstuning.com. Be sure to replace the nuts and bolts and do final torque with wheels on the ground.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas