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First I will say there was never a sunroof/moonroof option for the 4th generation Monte Carlo regardless of which style it was, the only roof option was T-tops.
Many options for interior and drivetrain were offered for most Monte Carlos with the SS having a few only for them but the exterior was the most notable difference since the Sport Coupe, LS, and SS. all had different front ends.
Sport Coupes - 1981-1986: (lower right)
Sport Coupes were available from 1981-1986 with a nose that is more square and has chrome headlight bezels, chrome wheelwell molding along with a chrome front bumper strip and grill. The bottom half of the nose is also made of urethane.
Sport Coupes have four separate headlights and two turn signal/driving lights on the bottom of the bumper. It also has a stand-up hood ornament.
They come with chrome trim around the windows and taillights and a wider chrome trim along the lower sides of the car and a chrome strip on top of the rear bumper.
"CL"
Sport Coupes were available with CL (Custom Luxury) trim - a trim package that included a deluxe interior with velour pillow top seats.
LS Monte Carlos were also available with this trim option. Both LS and SC Monte Carlos could have the CL option.
LS Monte Carlos - 1986 - 1988: (lower left)
LS (Luxury Sport) Monte Carlos were introduced in 1986 - the only year that you could get 3 different Monte Carlo models - SS, LS, and Sport Coupe. The LS would eventually replace the Sport Coupe as the "base" model Monte Carlo; there were no more Sport Coupes made after the 1986 model year. The LS nose was different than the nose on the SC, It was a "Euro" type of nose, rounded off with two composite headlights The stand-up hood ornament was replaced with a grill mounted emblem.
There are also minor trim differences between the LS and the SC: The 86-88 LS cars have chrome strip that runs down the side of the car on the raised portion of the door it was mounted higher than the SC's which had it on the lower portion of the door.
SS Monte Carlos - 1983 - 1988: (upper right)
The SS nose is the most distinct of the three cars; it is very sleek and aerodynamic. SS cars had blacked out grilles and all black trim as opposed to LS and SC models, which had chrome trim.
SS cars have with a very small knight emblem on the nose and very little exterior trim.
The SS also came with rear deck spoilers 1983-86 had a "stand up" style spoiler,
1987 was a transitional year so rear spoilers could be the "stand up" style or the new "lay down" spoiler.
1988 rear spoilers only came in the "lay down" style
All Montes Carlos- 1987-1988: (upper left)
These years changed the taillights to a smooth flatter style wraparound version and a smooth bumper cover that eliminated the recess in prior years for a cleaner look The 1981-1986 models have a taillight with a metal bezel and the reverse light angles downward.
(upper middle)
Also starting in 1986 all Montes had aero side mirrors that replaced the "bullet style" and were located farther forward on the doors.(shown on all 3 Montes pictured)