Here is a picture of an old style oil ring from a GMC 270 I recently broke (the ring not the 270). A ring manufacturer told me this style of ring is no longer available after they made an oil ring set to replace this broken one.

This oil ring was a series of three nested rings.
Attachments
270 Oil Ring.jpg (38.36 KB, 167 downloads)

Last edited by tom moore; 11/23/2020 6:58 PM.
1946 GMC Project
"Back-in-the-day Restore"
Read the story in the DITY Gallery