I contacted AE the same time I posted this with the same post and the same pic and they said the towers with the low bottom and hole are old stock and the ones in post above and on left in my pic are new stock,
In fact here's the reply I got from AE.
The picture did not come through but, what happened is called a running change. Since the shock tower is the virtually the same, and we only made very few changes to the shock tower we kept the number the same. The shock tower with the filled in upside triangle is the more current tower.
Thank You, Nick Wautlet
[email protected] Customer Support 26021 Commercentre Dr. Lake Forest, CA 92630 949-544-7500 xt 2115 phone 949-544-7501 fax