A two-seat model targeted at delivery companies is a midyear addition to the HHR lineup. These compact wagons are named for their "Heritage High Roof" styling inspired by early 1950s Chevrolet Suburbans. All HHR models have front-wheel drive and share a basic platform with Chevy's Cobalt. Regular HHR wagons seat five. They are joined by 2-seat "Panel" versions that lack rear-door- and quarter windows. Panels have rear side doors that unlatch via dashboard buttons instead of exterior door handles. Both are available in LS and LT trims. A 149-hp 2.2-liter 4-cyl engine is standard. A 175-hp 2.4-liter 4-cyl is standard on LT Panels, optional on LT wagons. Both engines are available with a 5-speed manual transmission or a 4-speed automatic. Included with the automatic is remote engine start. ABS and curtain side airbags are optional. All HHRs have air conditioning, power windows/locks/mirrors, and remote entry. A split folding rear seat and fold-flat front-passenger seat are standard on 4-dr HHRs.