Does one exist? I've search around on the board and google but haven't found any. Mainly I'm concerned with what exactly the spline on a non-vented opti looks like so I have an idea what I'm dealing with and how not to screw up alignment.

 

If it is spline pics you need, look no further.

 

A bit off topic, but since your going to be doing an opti installation.........If you diddn't know that it was a good idea.......take few dollar tube of Permatex silicone RTV and seal the new opti-spark unit "everywhere" it joins together.......the inner seal many times wont stand up to years of heat and possible water intrussion........IME, this is what causes 99% of the issues with them..........good luck .........Joe