possible crack pipe involevment

Real small customer base given this part was put on early 1968 build (1967) GTSs. Last one I saw on a car was a GTS that had a build date the first part of August 67.
From my research the part was unavailable on cars in the 4th quarter of 67. I have yet to see it listed on any build sheets even though it had a different part number that the grill.