I bought a rebuilt unit from ProgRama, but I haven't actually been able to test if it work or if the head unit was even the issue because when I was trying to test it, I noticed a broken wire on one of the connectors so I may not have needed a rebuilt unit anyway (though mine had moisture in it from when the AC condensate drains clogged). Mine was $112.50 plus a $20 core charge.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.