I bought a radio on ebay to replace the stock one in my 91 Eddie Bauer, not realizing mine has the JBL premium sound system. The unit I bought has an internal amp and two flat tab slots on the back so it won't work with my system and I'm going to resell it. Thing is, I can't find serial numbers on the case, I think they are covered by a factory "Made in Brazil" checklist sticker. Written in black marker on the top of the case is "92 T-Bird" and there is also a sticker written 1991 Ford Explorer, so I don't know where it came from. I could scrape the sticker off if you think that's where the numbers would be and if they would help identify it. I'm trying to find out which vehicles this particular DIN radio/cassette unit will fit. Which explorers? Mazdas? T-Birds? Broncos? Rangers? Is there an interchange chart for radios someone can point me to or can someone just tell me? Thanks.