FWIW, back in 2005 I looked at every VC for an FE I could find and the Blue Thunders were my favorite on looks alone... so that's what I got. But, they're nice and sturdy, have a reasonably flat bottom plane to help sealing (helpful, if you remove them to set the valves), they fit well over the components, and the baffles help prevent
oil getting sucked up the PCV. All of that is nice, but you should really just pick what appeals to you -- if they don't fit, return them.