1997 Ford Econoline Super Duty Engine: 5.4L V8; Molded Rubber;. 1997 Ford Econoline Super Duty Engine: 6.8L V10; Molded Rubber;. 1998 Ford Econoline Super Duty Engine: 5.4L V8; Molded Rubber;. 1998 Ford Econoline Super Duty Engine: 6.8L V10; Molded Rubber;.