Noob question - shaft couplers

Hello,

I am looking for quite a while for shaft couplers for may Optimum
180x300 lathe. I need for the transversal axis 6.35 mm( 1/4 inch ) X 6
mm shaft coupler and for the lead screw 12.7 ( 1/2 inch ) X 10 mm
shaft coupler. Would prefer Oldham, but it's not a request.
I have homeshop cnc RS34-600 and rs-23 260 steppers.
Does anyone have a clue where I can find them ( just online shop, not
websites where I have to place a price quote and then answer for 2
weeks to questions like why do I need it and finally tell me they
can't ship to my destination ). I am from Romania ( EU ) but have
someone in the US who can send those couplers.