For the most part, I would treat any '86-'89 as roughly the same, unless the location of the third brake light matters to you. It moved to the edge of the trunk in '88. What I have noticed is that the '89, being the last model year, commands a higher price than those other years.
It looks like there were some slight changes to the braking system in mid '86, a couple of relays. Probably not significant.
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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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