This is interesting. How about the parting lines between the cap and the block? In the first picture you posted (with the old bearing shells installed in the cracked cap) the bearing shell protrudes beyond the end of cap. Does the old bearing fit the same on the new cap?
I assume you are referring to the bearing shell protruding slightly from each side edge of the half-circle of the shell in the cap nearest the mounting surface? When I inserted the same bearing shell (the old one) into the new cap, it too protruded slightly on each edge and that matched up perfectly with the lower half of the bearing shell.
