They had to use a bolt with a hole for the drip tab. The drip tab eliminates the bottom drivers bolt for the thrust plate, and that would mean that the top pass hole is open also. I've never seen one from the factory with only two bolts....
I've seen some factory engines without the drip tab and no bolt in the upper pass hole for the thrust plate...
Also without a drip tab, the bolt with a hole, and three others....
