CREATE TABLE table_51680 ("Race" TEXT, "Date" TEXT, "Location" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Race Winner" TEXT, "Constructor" TEXT, "Report" TEXT)

What was the constructor for the fastest nelson piquet?
SELECT "Constructor" FROM table_51680 WHERE "Fastest Lap" = 'nelson piquet'
SELECT "Constructor" FROM "table_51680" WHERE "Fastest Lap" = 'nelson piquet'