I stand corrected. After rechecking the sources for the National camshaft seals, I have found that the part number is indeed 1213N. They are the correct part. I am sorry. Please forgive my error. I have corrected my parts list.
On a side note, when I installed the Fel-Pro seal set on drdave's SHO, we found that the seals in the Fel-Pro box were made by National and did not resemble the Fel-Pro OEM seals. They still fit and sealed, but they were a National product packaged and sold in a Fel-Pro wrapper.
You should apply a silicone grease (preferred) or motor oil to the inner wear surface of the camshaft seal before installation. The instructions that accompanied the Fel-Pro seal set also advised to use RTV (Permatex Ultra Gray for my installs) around the outer diameter to help seal the rubber.
<small>[ May 13, 2003, 02:36 PM: Message edited by: sdpatt ]</small>