Any decent hobbyshop should have these plugs, but i don't know about the crimping tools (is it necessary at all?). If i were to do this as o.p. is going to, i would have just cut them to desired length and soldered them back together putting shrink wrap on the wires. Or buy new plugs, crimp them with an regular plier and solder them on to the plugs aswell to get a good joint.