How To Custom Drive Shaft

[jtroyer06]

So i bought some of these drive shafts to modify and i was looking at them and the ends have to flat spots in the i.d of the connector, and my Tamiya input shaft to the axle and the output in the transmission both have just one flat spot for the set screw to seat. So they wont fit together with out being machine to match.. So is that was is required to make these work or did i get sold the wrong shafts from eBay or am i missing something obvious ? Please HELP!

Thanks Jordan