1980 Buick Riviera Information (parts, repair, etc.) ?

Iím wondering if anyone knows a good source for information on this vehicle? Iíve tried Mitchell OnDemand and AllData at school but
neither go past 1982. I also know there is information out there on it as companies like PartSource (Canada) have everything needed on this car on that year.
Thanks in advance if anyone can help.
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