86-93 Ford Mustang 5.0 Vacuum Tree Plug

86-93 Fox body Mustang 5.0's have a vacuum tree on the firewall.  The ends of the vacuum tree are in fact "caps".  The unit is NOT solid.  These can sometimes blow out (http://www.mikemartinelli.com/albums/Dads-Car/363-Stroker-Build/e6dc-9c491-aa.jpg) - Quick and easy fix for either side.  I do have the entire tree available if you'd rather go that route - it is more expensive than the re-popped one's but I do have it.