[Brian]

Fit gasket over the four studs protruding from rear mount, then the inner hemispherical cover. That covers the universal joint. Then fit another gasket over the four studs. So, now you have a gasket each side of that inner cover. Offer up the torque tube, aligning the uni joint into the driveshaft. Then, fit the outer two halves over the whole kaboodle, ensuring the felt seal is correctly located in the grooves in each half. The four nuts need to be 5/8 A/F, originally castellated nuts, I use nyloc nuts. And a coupla 3/8 bolts,nuts, spring washers hold the two halves together.