The FE* numbers are RPO codes:
http://www.corvette-web-central.com/...teRPOCode.html
I believe the FE5 belongs to the ZR1 Corvette with the J57 carbon/ceramic brake code, hence those being twice the price. They're the heavy-duty unitized hub assemblies designed specifically for the ZR1 application.
All of the hubs should be interchangeable from 1997-2008...then it gets a bit more complicated with the introduction of the ZR1 as noted.
Tobin
KORE3