Mustang Underhood Styling | Brothers Performance Turn your Mustang engine compartment into the centerpiece of the entire car with our selection of great looking Mustang billet dress up and styling components. Brothers Performance has a huge selection of Mustang aluminum and carbon fiber engine plenum covers, ignition coil covers and Mustang valve covers. Amazon: mustang fuse box cover Mustang Polished Stainless Fuse Box Cover Running Horse Tri Bar Emblem. 5.0 out of 5 stars 2. $33 $ 33. 99. FREE Shipping. Only 1 left in stock - order soon. Mustang Polished Stainless Steel Fuse Box Cover. $26 $ 26. 99. FREE Shipping. Only 3 left in stock - order soon.