The three different kits represent the three different horsepowers that were built on the exact same platform.
Between 1986 and 1994 and a half the 6, 8 and 9.9 Mercs were about 99% "identical" mechanically.
The differences between the three horsepower's were determined by the guts in the carb and the exhaust plate.
So if you check the carb kit listings closely you will note one for each of the horsepower's.
The most current part number I have listed for the 9.9 is 1392-8846A24 (which superseded 1392-8846A14 if you find some old stock listed).
Don't get overly concerned with the carb model number. Every couple of years the number changed slightly and the 9.9 2 stroke was in production between 1986 and 2012 (outside the US - 2005'ish was about the last US domestic model sold).
There was a platform change in mid 1994 where the 9.9 began sharing the 15 horse powerhead, but otherwise, parts for ANY 9.9 built before that date will absolutely fit your particular model year.
I have an 86 and an 87 model 9.9 and they just may be the best small outboard built by any MFG in an all time ranking.
And Jeff is correct, at about 100 US bucks for a full blown kit, your heart may stop for a second
But given that could give your motor another 25 years of service before it needs that again, just think of it as "4 bucks a year"
