These four-passenger coupes and convertibles slot between Mercedes' C-Class and E-Class sedans in size and price. CLK coupes have hardtop styling with no middle roof posts. Convertibles have a power fabric top, heated glass rear window, and roll bars in the rear headrests designed to pop up in an impending rollover. Three model levels are offered. The CLK350 has a 268-hp V6. The CLK500 has a 302-hp V8. CLK350 and CLK500 are offered in both body styles. Available as a convertible only is the high-performance CLK55 with a 362-hp V8 developed by Mercedes' AMG performance arm. All CLKs have an automatic transmission, a 5-speed in CLK55s, a 7-speed in the others. All have a manual shift gate, with V8 models also getting manual-shift steering wheel buttons. All CLKs come with ABS and traction/antiskid control. Front side airbags are standard; the convertibles' cover head and torso. Coupes have curtain side airbags. Rear side airbags are standard on CLK55s, optional on the others. All come with Mercedes' Tele Aid assistance. Options include a navigation system and Mercedes' Keyless Go, which uses a pocket transmitter for ignition and door-lock operation.