I have just installed msd coils and leads on our two R53s. I am now wondering If I made the right choice. I looked at how to fit the OEM fastener but couldn't drill out the msd sleeve as they would just spin around, tried gently tapping one out but they are well stuck in there.

So I have ended up using stainless button head M6 x 50 allen bolts with a flat washer between the metal inserts in the valve cover and underside of the coil, and another flat washer and spring washer acting on the top of the sleeve. I used blue threadlocker and tightened the bolts to just 5 ft/lb vs the 9 ft /lb for the stock setup. I feel that by using the small m6 flat washers i have only applied stress to the msd coil's inserts, but have no vibration isolation as described in this thread, so I am a bit concerned about it's longevity and cracking.

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Hard to say. I would think you need the insulating value of the factory parts. I would give MSD a call and see if they have a solution. Or Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.

- Nick