Dear Dave Stevens,
Hope you're well. "BTW, the rubber gear shift lever cover #29 p/n 6843562 is still available in the Volvo parts chain and at under $10 it's dirt cheap."
According to the diagram in Volvo Vadis - a superseded dealer parts/service database - part #6843562 is a small plastic collar (or bezel), that surrounds the shift lever's square steel core.
The shift lever's rubber-covered plastic knob (into which is mounted the over-drive switch) sits atop the collar (or bezel). The rubber-covered plastic knob is part #6843471. At a U.S.-based Volvo dealer, full retail is about $120.00.
Item #29 on the diagram is a "retainer" (part #945719), which secures the shifter's "intermediate arm" to the "retaining ring bolt" (the shifter's main shaft).
Hope this helps.
Stay well!
Yours faithfully,
Spook
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