taillights on previous years mounted from the inside and had a flush appearance. Starting in 1973, the taillights were mounted from the outside and were trimmed in chrome. These remained unchanged through 1976. The Dodge version, the Demon, was rebranded "Dart Sport" in response to church groups opposition to the word, "Demon." Other changes were in store for the Plymouth Duster. Simpler single-piston slider-type disc brake calipers were introduced for 1973 (standard on 318-powered cars and with power-assist on 340 models), replacing the Kelsey Hayes four-piston calipers. Disc brake-equipped Dusters now had the more-common 5-lugs on a 4.5-inch wheel bolt pattern. All 340 and some 318 engine-equipped cars received the simplified 8.25-inch rear axle assembly (with wheel bearings riding directly on the axle shaft and endplay being taken by C-clips); these axles also featured the 5 on a 4.5-inch wheel bolt pattern. (This axle assembly replaced the 8.75-inch "drop-out" arrangement seen on some 1966-1972 A-bodies). The 225-powered cars retained the 5-lugs on a 4-inch pattern on vehicles with the standard drum brakes. A three-speed Torque Flight automatic along with a manual transmission was offered with the 225 slant six. All models received larger front wheel bearings and increased spindle diameter. Electronic ignition became standard across the board. Also, a Space Duster package was offered. This allowed the back bench seat to be folded down, allowing more space to carry cargo. There is also a security flap to hide cargo from outside view. A new, metal sunroof was optional for 1973. The rear window defroster/defogger was upgraded to an electric-grid style for 1973, which replaced the previous recessed package shelf air blower. 1974 For 1974, Plymouth replaced the 340 with a version of the corporate LA-series V8, de-tuned to meet new emissions regulations. The new for 1974 "E58" 360 engine produced by utilizing the camshaft, heads, intake manifold, carburetor, and dual-exhaust set up from the past 340 engine. New retractable front seat belts were added. In the midst of the first oil crisis, 1974 would be the Duster's best sales year, with a total of 281,378 Duster-bodied cars produced, the majority of which being the six-cylinder and 318 V8 models. In 1974 there was a separate model called the Duster 360. Standard equipment included the 360 engine, dual exhaust, power disc brakes, full side tape stripe, rear tape stripe, heavier suspension, shocks, added sway bar, and 8 1/4" rear end. Plymouth