360 Spool Mount question

I purchased new ones from Advance Auto they came with the inserts. But the drivers side one was not a 340/360 mount it was a 318 mount, don't know if the box was marked wrong or the company making them didn't know there was a difference.

I used it any way and just made up a spacer to take up the space difference between the 318 and 340/360 block ears.