http://speedways.co.uk/apec/list/porsche/5.htm
-here you can see with the rear disc spec the difference in the 85/6 only discs and the later typpppppppppe
-late 944 disc 100mm
-85/6 alloy arm - 70mm
-30mm increas in track
-86 arm is same as steel arm with 22mm spacer
-so 87 alloy arm = 52mm wider track than bug
-86 if its the same as steel with 22
-simply increases the track 22mm
?
-also note steel arm disc is 289 by20mm
-where as 86 alloy arm is 299 by 24mm -4 pot brembo
-also worth noting that the late 911 uses the same disc? -299 by 24 -but as standard is drilled?