Just a few more Fyi's from my experience.

The ID coins are hit or miss. Out of about 10 K-frames I have only 2 have the coins.

The angle has been measured to about 3.5 degrees. This was probably within the crappy tolerances the factory used in my opinion so it even if you get a 70 B in an E or vise verse it should be fine. The coupler will more than compensate for that. As long as it doesn't bind your OK.