CREATE TABLE table_204_511 (id DECIMAL, "number" DECIMAL, "driver" TEXT, "entrant" TEXT, "chassis" TEXT, "engine" TEXT, "tyre" TEXT)

what kind of chassis and engine did the fastest driver drive ?
SELECT "chassis", "engine" FROM table_204_511 ORDER BY "number" LIMIT 1
SELECT "chassis", "engine" FROM "table_204_511" ORDER BY "number" NULLS FIRST LIMIT 1