GTAm Wheels Question

[alfaguy@domain.elided (David J. Anderson)]

Everyone knows what GTA, GTZ and SZ magnesium wheels look like.  But GTAm 
parts are more mysterious.  The wheels used on the GTAm were normally 13 
inches x 7, 8, 9 or 10 inches wide.  To use 13 inch wheels on a 105 
chassis, different mounting brackets and/or lower profile brake calipers 
were needed for the wheels to clear the brakes.  The factory solution was 
the ATE one-piece aluminum caliper (which is the same unit used on early 
911 Porsche 'S' cars) and special bracket.     The most widely used GTAm 
wheel was a dished design with 12 circular holes.  After 1970 the same 
wheel was homologated for use on the GTA Jr. and it seems that most racing 
GTA Jr's used the GTAm wheel in Europe.  The same wheel is used on the 
racing 33's.  There was another wheel available for GTAm - but no one seems 
to know what it looked like.  The options list shows a 15x7 inch wheel, and 
the parts catalogs list a number and describe it as weighing 5.8 kg and 
having oval holes.  No photo is given in the catalogs.  Has anyone ever 
seen the 15x7 GTAm optional wheel?  Is there a reference with a photograph 
of this wheel?
Dave Anderson, alfaguy@domain.elided

------------------------------