Well with a what little searching I've done, there doesn't seem to be a rebuild kit for these. Even called with the F--- "angle of approach" as the Autopsy site showed.

Figure someone here would know of this & mentioned on previous threads if it were so, but I have to ask: Did C body's of 70-71 use this metering/hold off valve?

If so, there may be a used one about 12 miles away. If not, (meanwhile back at the ranch) I'm waiting on a return call for a used B. Lol all this for just a rubber cup!