the joys of public key-rings (NOT)

To all,

We have downloaded a PGP 5.0 Key-Ring from a key-server and expecting a new 
format (OpenPGP) header (0xC6) with a version 4 public key (new format 
packet), we are getting an old format header (0x99) with a version 4 public 
key (new format packet)!
So, what to do for the transfer of public key-rings????

Do we use:

1) old format headers with old format packets
2) old format headers with new format packets
3) new format headers with old format packets, or:
4) new format headers with new format packets???

Please help as we are just sitting here drinking lots and want to get back 
to programming and testing...
TIA.