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The MPA-306F had 9 terminals so it wasn't the right switch, but did work. The correct one will only have 3 terminals. When I sold my '87 I gave the buyer my extra switch.
I think the 86 switch is the same as the 87 which is available from Mouser, catalog number, MPA 106F. The switch is made by Alco (a switch company). I paid about $13 not including shipping. You can order on line, www.mouser.com