Page 61? (The C&C 37/40 Sail Plan) of the 37/40 Owner's Manual shows them faintly. In this drawing it shows the Running Back and Checkstays meeting at approximately the end of the boom (but are not attached to the boom), then continuing to the blocks on the toerail at the stern.
https://drive.google.com/file/d/0B7X4Y5iVFYAKV09MQTZmSzlxejA/view?resourcekey=0-CSGcNyb4w0UcN49EypcO8w
Your contributions help pay the fees associated with this list and help to keep it active. Please help by making a small contribution using PayPal at: https://www.paypal.com/paypalme/stumurray All contributions are greatly appreciated.