The upgrade was completed earlier this week and was done by my dealer. Interestingly, the flying H center caps installed in the factory V8 center
wheel covers are bare metal glued into each cover with no plastic backing unlike the 17" Genesis
wheel caps that you refer to(the $40.00 ones).
The dealer sanded/ground down the long and short plastic pins on back side of the 17" caps(that was not a problem) and then glued the caps with their shaved down plastic backings into the
wheel covers. They look good in my opinion(and that of my dealer) but don't fit entirely flush within the
wheel cover space as did the flying H caps.
If there were a way to totally remove the plastic backing from the 17" Genesis caps resulting in the only the metal cap portion being left, the fit would be perfect.
I'm awaiting pictures from my dealer and will post them once I receive them so forum members can decide if this is worth doing to their 4.6's.