Dear Tim,
Hope you're well. The Bosch alternator's carbon brushes are Volvo part #3544572, according to Volvo VADIS, a superseded dealer parts/service database. It seems that in the 1992 models, the Bosch alternator (100 Amp) was standard.
I'm sure this VADIS parts diagram shows a Bosch (not Nippon Denso) alternator, because the Bosch voltage regulator (Volvo Part #9130518) is very different from the regulator on a Nippon Denso alternator. This Bosch part - based on photos on the www.fcpgroton.com website - seems to include the carbon brushes. See: https://www.fcpeuro.com/products/saab-voltage-regulator-9-5-1197311213#fitment .
If you want only the carbon brushes, see: https://www.volvopartswebstore.com/products/Volvo/Carbon-brush-set-Genuine-Classic-Part/1141966/3544572.html .
Your local Volvo dealer may be able to supply the brushes. The cost should be about US$19-20.
Hope this helps.
Yours faithfully,
Spook
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