HELP!!

I'm new to this group, but not new to resto projects. My son and I were given (what we were told) was a 1956 Packard Clipper. We got it home, checked it out, I did some research about replacement parts. I found several places that had all that we needed.We completly removed all of the front and rear suspension. Then we took out the engine and transmission. Still thinking this was a 56 Packard Clipper. When I went to order all of the front end parts, I was told this actually is a STUDEBAKER! I tried telling the guy on the phone" my car says Packard Clipper" all over it . The Pink Slip said 1956 Packard, I told him he didn't have a clue about what he was talking about. He laughed and insisted it wasn't a Packard. My son asked me "now what do we do"? I told him I don't know now. Did Studebaker make "Packard" cars, and if so, how do I tell where Packard left off, and Studebaked take over. I'd hate like hell to buy alot of parts for a Packard and get them home only to find they don't fit. Do I buy Packard , or Studebaker replacement parts, and for what model? The vin plate on the left front door post starts out 57L snipped-for-privacy@hotmail.com