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Those codes were taken from the paint makers books (year 1989 for both), for Volvo paint code #89 - Light Blue.

In the UK, my local Halfords, your NAPA or Pep-Boys, can make up an aerosol or a pot of touch up from a mix on their computer. The percentages of the colours and base are measured out by hand so you have to have faith in their ability, which as they tend to be youngsters on a McDonalds type of pay rate, is a bit like tossing a coin. Your paint supplier should get it spot on every time. Note, if your car is #89 now it will be best to paint the whole car as it tends to show a range of shades from grey to blue depending on the lighting. A bright but sunless day will show up shades on the car if it has had any parts, wings, trunk, hood etc., separately painted. I don't know what colour primer Volvo used but the final colour will be affected by its colour. i.e. white primer will give a lighter final colour than one of the darker shades. Light grey might be good.