Contacted EB Spares in England.
I received the correct rearmost flex disc for my 78 Sport sedan. In 3 days....
With shipping $142 US
The original one that was installed on the car with the other 2 new flexdiscs did not pilot to the nub poking out of the rear driveshaft. That's why my clutch housing exploded.
I had trouble locating the correct flexdisc new so I got a used one.
Couple months later I feel vibes....not good...that used flexdisc is developing cracks.
I began my search. One place told me they had the correct one, but I would have to take the center out of my old one and fit it into the new one.
I had already ordered one from EB but though why not pull the used flexdisc out and see if that would work. .Uh, no. Even if I could get the center piece out of the old one and press that into the "new" one, the dimensions were not correct.
Sooo, it's all together and smoother than ever.
It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS