Hi Ron, Thanks for the order.  I am out of the SK1 in red but I do have it in Black/grey size 37/38.  I am totaly out of the Pro Race in a 42/43 but I do have it in 44/45 in Yellow/Grey and Black/Grey.  I also have the SK2 in Black/Grey size 42/43.  The SK2 is a slightly heavier, mid volume sock than the Pro Race.  Please e-mail me to let me know if any of these choices will work for you.  You can also call 800-253-7078.  Thanks Gary