Would probably get two 7-515 kits as they have the longer thru-sleeves that will need slightly shortened and also will need drilled out like you said. From what i could see, the only difference in the 7-515 and 7-514 kits is the thru-sleeve. The inserts were the same in both kits.
Yeah, the inserts fit just like factory. Very solid too. Not sure if they were engineered with 600+ hp in mind though lol!
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