I have seen the 10 point key used in the ECR33 before, both in pictures and physically in a ECR33 and S14 myself. To best describe how it was done; the key was cut on the end of the 10 point key meaning that they key sat further out of the lock or ignition than the normal 8 point key would. The shoulders (which connects the bow (handle) to the blade) of the key are the same thickness on a 8 point or 10 point key however neither of us a locksmiths and that's why i noted above that the buyer should contact a locksmith prior to purchase in my initial post.