Wrong Parts to Repair a Spool Mount?

I have replaced many of these and they always include the shell on the new ones. But yes, I have seen some that are not shaped correctly like yours. Its just a piss poor made part, dont use it.
Sometimes you have to open the hole up just a hair with a die grinder but the shape should be right. Im talking just a de-burring. Also, I seem to recall the hole on one side being slightly smaller so the insert has to go in a certain side first. Once its in and sitting flush it just needs a couple tack welds. You can reflare it with a punch and hammer but its really hard to get it tight like the originals.