The '98-99 turbodiesels do indeed have a completely different vacuum pump design that will not spit trash into the timing gallery should it fail. This later pump can be retrofitted to the '95-97 OM606NA engine providing the timing cover is also replaced. Since this is not a trivial job (or expense), most of us just replace the pump with a new one and soldier on. The pumps are in any case less likely to cause trouble than the early 124 pumps with open bearings.

Jeremy

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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