I found this:
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ok... here in New Zealand we have a very large variety of mk3 bodies but here is how you can tell the differences on them regardless of what year the registration ticket says it is
(just as a sidenote these body differences may not apply to northern hemisphere, most of what is shown here is what japan sent to the southern hemisphere
)
86 supra bodies....
aerial in back windscreen
body moulding looks like this on jdm models (usa used 87 moulding from 86-88)
windscreen washer jets are small stubby ones like this
86's also have a parklight switch whereas in nz in 87 they got changed for a coin slot (in the usa i believe they still have parklight switches)
86 supras are also narrow body (flat sides, guards aren't flared out etc)
here's a pic of a narrow body & widebody... you can see the yellow one has wider front guards than the white one
also as shown above... the white supra is an 86 but had the 89 bumper and spoiler conversion done... so 86-88 = yellow bumper, 89-92 = white bumper (if you look at the turn signals you will notice that they are exactly the same as the yellow ones.. 86-88 turn signals)
taillights look like this
factory 86 spoiler shown above
87 bodies...
aerial in back windscreen
87 moulding is exclusive, it is not on any other year... you will never mistake an 87 unless someone went through the trouble of changing it all (which i doubt someone would go through the trouble with)
87 moulding comes in 3 colours... burgundy, gray & blue
87 moulding pic
windscreen washer jets change for 89 to longer nice looking ones
as shown previous... widebody & narrowbody
all 87 supras are widebody from the factory
the yellow one is an 87
taillights and spoiler are still the same as 86
87's also came with seatbelt holders which the 86's didn't come with (in the USA only 89+ got seatbelt holders)
87's had a coin slot in replacement of the parklight switch (in nz, not sure of other countries, USA 87's did not come with coin slots factory)
88 bodies...
aerial in back windscreen
back to narrow body style
still retains coin slot
no seat belt holders in 88's
still have the newer style windscreen washer jets
still have 86 style taillights and spoiler
back to 86 style moulding
89-92 bodies...
aerial changes to an automatic one in the right rear quarter in spoiler
taillight style also changes
spoiler changes to a new 3 piece with spoiler light
body moulding changed
windscreen washer jets are still the long sleek nice ones
all are widebody (but..... generally the ga70 1ggte is an exception to the rule)
front bumper changed as well as turn signals
have a look at the front bumper and turn signals between these two.. the turn signals on the purple 89 are shorter and have little black grills rather than the yellow one which has one grill that spreads right between the two
if you have any other questions on body diff's post em up and i'll answer them the best i can
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So I guess you are right.