You either have a 1962 or later 292 with C2AE rods or a heavy duty 292.Early HD 292's used 312 rods, marked ECZ on rod and rod cap.
61 and later HD 292's used C1TE rods with ECZ on rod cap.
Standard truck and car 292's after mid 62 used C2AE rods with ECZ on the rod cap.
All Y-Block rods except EBU used ECZ rod caps.