Steeda strut tower brace for 5.0 with Boss manifold. Will also work on a V6. Here is the link to the description from steeda's website. $100 shipped.
www.steeda.com/steeda-v6-boss-mustang-double-bar-strut-tower-brace-555-5718/
www.steeda.com/steeda-v6-boss-mustang-double-bar-strut-tower-brace-555-5718/