Is there anything about the model number on stock Ford head units that tell you what year or model you can swap out. My stock CD is dead and a new aftermarket head unit isn't in the budget right now. I was hoping to score a used one on ebay/craigslist or at one of the local salvage yards to keep it on the cheap and simple, but it looks like some that resemble my stock unit don't have the hardware on the sides to mount directly.