I take it the ones needing faceplates are not OEM MB Radios or they are?

Check with cleeve @ lajolla audio.

If they arent oem radios, you could pullt he unit, get the model number and contact the manufatcurer, but expect to pay $$$ to replace a lost faceplate from a radio that has removable ones. almost the cost of a whoel radio.

If they are OEM radios, cleeve may be able to help you.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon