ConcoursMustang Forums
1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1967 Mustang => Topic started by: 67gta289 on February 27, 2020, 06:40:01 PM
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I have a line on a set of C7ZZ-15511-B and C7ZZ-15512-B which according to the MPC was introduced on 4/8/1968.
My car (December 66) should have the -A version.
The backup light document by Marcus (link below) says that the difference was only in the light bulb socket, and there are no external visual differences.
http://anghelrestorations.com/uploads/3/5/1/2/35122002/back_up_lights_v1.1.pdf
Does this mean that the bulb is a different type as well? If not, why would Ford continue to carry both versions for service?
Thanks
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No, same 1156 bulb.
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The 1157 bulb will fit bulb and work, but the correct bulb is the 1142. The difference is the 1142 is a single filament and the 1157 is a dual filament (Stop and Turn Signal). I did not do a deep research of all years, but it was used in 66 to 68 and probably many more year of first generation Mustangs.
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Thanks for the replies.
Back to the original question, restated:
If the only difference between the two was a change do the light bulb socket, and if the actual bulb requirements did not change, and if there is no visual difference between the two, then why didn't the revision B part replace the original revision A, instead of carrying both with a running change date? I suspect that there has to be something more...