CREATE TABLE table_68021 ("Team" TEXT, "Truck ( s ) " TEXT, "Driver ( s ) " TEXT, "Primary Sponsor ( s ) " TEXT, "Owner ( s ) " TEXT, "Crew Chief" TEXT)

Parts Plus sponsors what driver?
SELECT "Driver(s)" FROM table_68021 WHERE "Primary Sponsor(s)" = 'parts plus'
SELECT "Driver(s)" FROM "table_68021" WHERE "Primary Sponsor(s)" = 'parts plus'