In July 2008 I replaced both the clutch and the fan on my 603 with the 606 clutch and plastic fan. Works fine, didn't cost that much. The 606 clutch is very similar in beefiness to the 603 clutch so you could mount the metal fan on it if it were modified but why bother? The plastic fan is lighter and spins more easily.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970