[Healeys] Parts applications

[BJ8 Healeys]

Hello, Healeyphiles -
 
Can anyone tell me the model application for exhaust manifolds, AEC 2050 and
AEC 2051 [BJ7/BJ8 parts numbers are different]?
 
Engine front side cover/generator bracket AEC 689 [BJ7 uses this, but BJ8s
use a different number].  Any other models use it?
 
Front brake caliper, P/N DA 17500 [not in BJ7/BJ8 parts manual].
 
Distributor housing with mechanical tach drive, P/N AEC 685 [BJ7].  Do other
models use this, too?
 
Thanks for the help!
 
Steve Byers
HBJ8L/36666
BJ8 Registry
Havelock, NC  USA