This is getting crazy... Spoke to Bosch directly and they said the AL170 is for a CT - not Diablo and is wrong application. The original Bosch #with the "A" means it's propritary and can't buy in US other than dealer.
But he did go own on to tell me that a 1988 Ferrari Mondial is the same application.... trying to work that angle now.
BTW the current AL170 alternator is 85amp and the Diablo s/b 115 amp...may be part of the problem...