CREATE TABLE table_4550 ("Team" TEXT, "Chassis" TEXT, "Engine" TEXT, "Tyre" TEXT, "Drivers" TEXT, "Races" TEXT)

What Chassis did Memo Gidley use?
SELECT "Chassis" FROM table_4550 WHERE "Drivers" = 'memo gidley'
SELECT "Chassis" FROM "table_4550" WHERE "Drivers" = 'memo gidley'