It took a few calls and a bit of friendly BS, but I found a dealer parts guy who helped me look this little bugger up in their system. It's called a 'GUIDE SIGN', and for the control unit that I have (126-830-02-85), the part number is 124-821-29-67, and costs $5.95CDN at the dealer + postage. (Sorry Billybob, that number you gave me was for another unit, or another part, and came up at $146.00CDN).

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1986 560SL
2002 Toyota Camry
1993 Lexus