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1983 Buick Riviera - Can't find a part

im looking for a heat actuator valve gm number 25506257

Looks like GM discontinued that part in 2006, good luck
https://www.partsgeek.com/catalog/1983/buick/riviera/climate_control/heater_valve.html

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You might consider checking Hemmings Motor News. There are a number of sellers in that publication
who provide parts for many older cars.