I measured my P38 DC.
ATA: 37 3/8"
Brace Height: 6.5"
On the cams where the cable attaches the measurement is 9/32" , from the center of the hole in the screw, to the limb. This is viewed from the side of the cam where the timing marks are.
Sorry I don' t know cable lengths. Hope this helps. If you need a pic of the cam, let me know.