The radiator hose for the 560SL top comes out at the extreme right side of the radiator. The 380 comes out left of the middle if I recall. It also seems that the 380 has a oil cooler. other than those issues the chassis should accept either I would think.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician