well no way to tell just from the tweeter since older model ES used a tweeter that looked similar to that one. If you can get to the drivers in the door if its red it could be either the CL,EF, or HD...if its yellow its ES. Sometimes you can tell by the crossover but its easier by the woofer, heck if you take it out of the door it'll say on the back. Most common would be the CL or EF. HD would be nice for you though. Whats powering them also?