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That's a good question for the OP. Those air box clips are very breakable so a good chance something has been replaced from another year/engine that may not be exactly the same. As others suggest the cartridge filter rubber lip usually has a fair degree of forgiveness depending on the brand, typically +/-1/8" to +/-1/4". I've mostly bought Mann filters over the years and often had filters that are a bit too snug or loose in the box slot, but by the time the cover is clicked down there's a good seal.
Mann (a known OEM to Volvo) lists the C43831 (C4383/1) filter as the correct fitment for the OP's 1989
size 13.19" x 6.5" x 1.46"
cross referencing to Volvo 1326352, 463505 and 463640
fits Volvo 240 B230F 1985-1993, B23F 1983-1984, B21F 1980-1982 and a couple of carb'd/diesel variants
For additional reference here the 1989 Volvo parts fiche shows
#5 Air filter p/n 463505 (NLA, supersedes 9438216)
fits Volvo 240 B230F 1985-1993, B21F 1975-1978, B20F 1977-1978, plus a few carb'd variants
#3 Air box cover p/n 463503
fits Volvo 240 B230F 1985-1993, B21F 1975-1978, B20F 1977-1978, plus carb'd variants of those years
#6 Air box housing p/n 1336925 (NLA)
fits Volvo 240 B230F 1985-1993
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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