Autolite / Motorcraft Four Cylinder Distributor Caps and Rotors

Ford officially launched Motorcraft parts division in 1972. This new brand replaced Autolite owned by Ford since 1961.
 Autolite Distributors were installed after 1966 for imported N.American Anglia 105E / 123E, Cortina MK2 '67-70 and Lotus Cortina MK2, including V4 engines.
Autolite produced two types of distributor caps and rotors for the Autolite and later Motorcraft distributors:

C7BH-12106A (1967)

C6AH-12106A (1966)

Physically the same caps except C7BH has approx. 8 degree advance rotor contact position.
I could not find any information on why Ford decided to develop this new type C7BH cap along with C6AH cap. I can only guess that the Autolite C7BH cap was produced for high revving Lotus Cortina MK2 engine in 1967 which is the correct cap and rotor C6AH-12200A for this model.

                        C6AH-12200A (1966) DORY-12200A                                 DORY-12200B



The rotor on the left is meant for the 1500 / 1600 GT engine and on the right is a larger area contact rotor meant for the 997 to 1600 standard engines.

According to parts suppliers all caps and rotors are interchangeable but the problem arises when a DORY-12200A ( GT ) rotor combines with a C7BH ( standard ) cap. The rotor doesn't align with contacts of the cap. Moving the distributor to align the contacts will alter the dwell.

In the 105E parts book lists Autolite cap as C6AH-12106A or C7KH-12106A which is the correct cap for a 997/1198 engine but the rotor listed as C6AH-12200A or C7AH-12200A is incorrect. Should have:
DOAH-12200A or DORY-12200B.

Lucas Electrical parts reference for Capri 71-73 1600 and Cortina 67-70 1600 combines RA2 rotor and DC4 cap as a set which is also incorrect. Should be DC7.

Match: Cap C7BH-12106A with Rotor DORY-12200A or DORY-12200B
Match: Cap C6AH-12106A with Rotor DORY-12200B only
No Match: Cap C6AH-12106 with Rotor DORY-12200A

Interchangeable:

Advanced Caps: Ford C7BH-12106A, Motorcraft EDH-13, Lucas DDB757 ( DC7 ),
Niehoff FF 60 E, Standard FD 146, Autolite DHE-155

Standard / Deluxe Caps:  Ford C6AH-12106A, C7AH-12106A, DORY-12106A, Motorcraft EDH-12
Lucas DDB754 ( DC4 ), Autolite DHE-156.

Short contact rotors ( GT ): Ford C6AH-12200A, C7AH-12200A, DORY-12200A, Motorcraft DRE-90,
Standard FD-113, Bremi 9563.

Long contact rotors ( Standard / Deluxe ) : Ford DOAH-12200A, DORY-12200B, Motorcraft DRE-91, Standard FD-112.