the 4-door hardtop, the front driver and passenger seat belt shoulder strap was connected at the top to the ceiling, however, the upper portion could be detached, with the shoulder strap resting on the driver's and front passenger's shoulder without the seat belt hanging from the ceiling. The upper part would then swing up to the ceiling and could be fastened into place. This arrangement provided an additional benefit to the rear seat passenger opposite the driver because the front passenger seat could be pushed forward with the head restraint removed, providing the rear seat passengers an unobstructed view through the front windshield, and both side view windows, adding to the luxurious feel of a hardtop luxury sedan. The level of comfort, convenience items and chassis technology was vast in relation to other products offered at the time, and the buyer could choose from seemingly endless options. Some of the items included a digitally synthesized AM stereo/FM stereo radio tuner with the ability to listen to broadcast TV stations, and a cassette tape player with recording feature to function as a dictaphone, stereo and cruise control buttons integrated into a fixed position steering wheel hub, and sonar-based backup sensors installed in the rear bumper. Rear seat passengers were also pampered, with the ability to control the stereo and climate control functions from a control pad located at the leading edge of the rear seat armrest, that could be dislodged from the armrest and function as a hand-held remote, along with separate reclining seat and backrest combined with a cellphone located inside the armrest compartment. The Wagon and Van versions continued in production after the introduction of the succeeding Y31, Y32, and Y33 versions, with the Wagon version ending production in August 1999. The wagon trim packages were the V20E SGL at the top, with an optional DI-NOC woodgrain appearance, the V20E/28D-6 GL, and the V20E Deluxe. Wagons (intended for private buyers) were mainly available with the VG20E petrol unit and the RD28 diesel engine (until March 1994). In 1993, Great Wall was able to make clones of the Y30 under the name CC1020. Seventh generation Y31 For private use, the Y31 was built from late 1987 through 1991, available as either Sedan or Hardtop versions. This generation was one of Nissan's most popular series, as the Japanese economy was very robust before the advent of the Japanese asset price bubble