In short
It's the flame tube of an individual can of a cannular combustor, a combination of can and annular combustors, likely from one of the variants of JT8D engine powering older Boeing 737 and MD-80.
It cannot be from a CFM56, all models use annular combustors. The three main types of combustors:
You can spot easily the interconnectors of the cannular type, also visible on the lamp support.
Details
Recent Boeing 737 and Airbus A320 can use different engines:
- CFM56 models -3B, -5A, -5B, -7B,
- IAE V2500,
- PW1100G,
- LEAP
All have annular combustors, single fuel nozzle (SAC) or dual fuel nozzle (DAC) for NOx reduction. However older versions of Boeing 737, -100 and -200, used a JT8D engine with 8 cannular combustors, the beast you got. In cannular type, the individual combustion zones share a common annulus casing:
Detail of a combustor:
The part making the lamp support is the flame tube (liner) of the combustor. The external air casing has been removed. I wasn't able to identify the exact version of the combustor, there has been multiple improvements over time on the JT8D, a famous engine, still used today.