I was going to say SCE but I don't see anything they offer with a "P" in the part number. That post was also from several years ago so those particular gaskets he was referring to may not even exist any more. In their current catalog they list a set that are 2.25" x 2.4" but they are for "ported" Magnum heads so unless I'm wrong I don't believe they would work on standard LA heads. 2.25" wide also seems like a misprint, I'm guessing they are 1.25".