The base is unique/common but it may be possible to replace, for example, just the monovalve by taking apart a new one and moving just the solenoid valve assembly. Ditto the pump, if it's not possible to rebuild yours. OTOH, it may simply be clogged. Disassemble and inspect before spending all that $$$.

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