Does anyone have the correct part number for a windshield washer reservoir cap for a 1988 420 SEL?

TIA

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I'm wanted in four states, but it's all good. Got me a new driver's license and a sweet new pickup. V-8, Baby, five-hundred horsepower. Oh, and four of them mudflaps with the naked ladies on them. GRRRRRRRR, MAMASITA!!! And the best part is, it's all free!!! Yeah, well, for me at least!!!! HA-HA-HA-HA-HA!!!!