The 82 may have the older five-panel lights. No swap there. If it has a six-panel light, it will fit the 86 hole but it won't work right.

Beginnning in 1986 the hi-level brake light was a requirement and Volvo, in its infinite wisom, diddled around with the lower level brake/tail light system.

The lower outer tail light became a two-filament tail/brake light. The upper inners became rear fog lights, controlled by a dash switch just below the headlight switch. The lower inners remained tail lights.

It's that two-filament lamp bulb holder fitting that's the non-swap. There is a way to make it work but it's hard to describe. Naturally the swap requires the 1986 circuit board, which will fit once you successfully get it off the old unit and carve off a locating pin or two.

Good Luck,

Bob

:>)