I had the same problem with the Felpro 1811.
I bought 2 sets and the 2 seals in each pack are different sizes though they have the same part# on the seals themselves.
The picture is not precise but when 2 hold the 2 seals against the ruler, they are different lengths and did not fit correctly in the caps.
Both D0AE-6723-B2. The shorter one has a Ford oval with a 84 after it. The longer one, has a Ford oval which is not clear with a 79.
I think if I remember, I just reused my old seals..
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