The command you can use to find the missing filesets is:
# instfix -ciqk 5300-05_AIX_ML | grep :-:
This will give you output similar to:
# instfix -ciqk 5300-06_AIX_ML | grep :-:
5300-06_AIX_ML:bos.aixpert.cmds:5.3.0.60:5.3.0.0:-:AIX 5300-06 Update
5300-06_AIX_ML:bos.aixpert.websm:5.3.0.60:5.3.0.0:-:AIX 5300-06 Update
You will need to download the filesets you see listed in your output, if you dont have them already. To be completely at the proper TL (technology level, even if the old ML (maintenance level) abbreviation is still used for instfix.