Clark Y-15 airfoil plot?

Ok, I ran into a little problem...

I'm laying out the rib design for a 1931 Georgias Special and it uses a
Clark Y-15 airfoil. The coordinates (stations if you will) for upper
and lower surfaces start at the leading edge and go back to the rear
edge. Chord is supposed to be 48". Adding up the distances in the
drawings (the 1931 Flying and Glider Manual, reprinted by EAA) add up to
54 inches. So...does anyone have the airfoil coordinates for this
airfoil (and I assume they would be expressed as something like 2% (aft
of leading edge), bottom =0.75" lower surface and 1.5" upper surface, 5%
(aft of leading edge), bottom surface = 0.25", upper surface = 2.25",
etc.)? It would be even easier if someone had the coordinates for one
with a 48" chord

Thanks for any help!

Scott