E5 would be close to a 5mm bolt. I believe I read they are all e-12Top bolts on the tranny bellhousing, but I only surmised from the fact they are really weird and I knew you were thinking about doing the clutch. I don’t think mine are the same. I believe mine are an E-5.
Clutch doesn't look too bad, not great but I expected a bit worse. The throw out bearing is toast.
I assume there is a diy for extending the breather on the trans. It's pretty pathetic.