I just took a look at those. The 4mm turnbuckles go up to roughly 5-1/16" and are sold at a price each. You'll need to have a desire to spend a whole lot of money for linkage rods at that length. Longer would require the 5mm for even more $$. The 3 and 3.5mm turnbuckles are not made long enough for the elevators. At that kind of money for two rods you can make for less than a buck, getting "hooked up" would be an appropriate term.

But hey, if that's what someone wants to do, spend it.