Last two pics on the bottom of this page should give a decent look, as installed on the car:
http://www.924.org/models/CarreraGTS_GTR.htm

I've been contemplating making some, for my replica of the white car... just don't know if I'd be allowed to run on-track with them, or if they'd be considered hubcaps...

------------------
Vaughan Scott
Detroit Region #280052
'79 924 #77 ITA/GTS1
www.vaughanscott.com