Looking at the DL/1 manual in the OS360 file section (
/g/hercules-os360/files/DLI/360D-01.6.007.pdf ), on page 161, it refers to IGG019Z8 as the Channel End Appendage (CHEAPP), but this is no guarantee it will work in MVS 3.8.? It also indicates it should be copied to SYS1.SVCLIB, along with other DL/1 IGG modules (which could already exist - I didn't check).
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As usual, make backups and proceed at your own risk.
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Shawn Goodin