That's the first time I've seen that. IMO I would look up NOS4gn.com and look at their coil packs... they have OEM and high output guaranteed to work - and Glen and the fam are great people with great customer service. Pricing is good too IMO.
we offer the ac delco one which has jumped in price found others failure rate was not acceptable yes some others have a smooth top and others require deeper screws as mentioned....
you have to remember a lot of private label happens one company makes the part and its packaged under various other names...
You can walk into any auto zone advance auto and I can spot which are cardone boxes under another name..
again may not be the answer you want but in our business its tough keeping things available and straight...