2003 - 2007 Classic should work. If your buddy had an 01-02 LB7, that might be what the problem was.
Also, if the key fobs he gave you were old, they may just be bad. I'm on my 3rd key fob on my 2003. After a while, they just stop working, even with brand new batteries. They are only $20 each on eBay for new (foreign knock off) ones, and they last just as long as OEM. That's what I'd do if I were you.