Listed below are part numbers for Chevelle coils.  Data are arrived at via Factory Assembly Instruction Manuals, where applicable, and other resources. Other GM makes may use the same coil for an applicable year.

 K66 Transistor Ignition1115176
 V8 (L79)1115202
 K66 Transistor Ignition1115207
 283/327 V81115204
 K66 Transistor Ignition1115210
 396 V8 through Feb 23, 1966*1115204
 396 V8 after Feb 23, 19661115242
 283/327 V8 through Oct 20, 1966*1115242
 283/327 V8 after Oct 20, 19661115267
 396 V8 through Aug 9, 1966*1115204
 396 V8 after Aug 9, 19661115242
 307/327 V81115293
 396 V81115267

* The used through dates are only approximate. Older items were used until supplies were exhausted and could vary from plant to plant.

It should also be noted that if you went to a Chevrolet dealer parts counter you may not get an exact replacement number as part numbers were consolidated for like applications.  This image taken from Chevrolet Parts Book dated early 1972.

There were at least two versions of the "Delco-Remy" script on the top of the coil as well. The left photo shows the letter "y" on the same baseline as the rest of the text. The right photo has the letter "y" extending below the baseline.

  Courtesy Rich Cummings

The side of the coil has the last 3 digits of the part number and either "B-R," "12-V" or "12V" in raised characters. The meaning or difference between the "B-R" and "12V or 12-V" isn't known at this time.

Courtesy Rich Cummings
This 1965 example from an L79 engine shows a dash (-) in 12-V.

Another 202 coil, this from a 1968 396, but notice there is no dash (-) in 12V.

Courtesy Jacquie Benthin
Courtesy Jacquie Benthin.
An example of a 1967 396 ignition coil.  Note there is no dash (-) in 12V.

This example of a 1115238 Delco replacement coil shows another variation. It's embossed at the bottom of the coil and only embossed with "238" and no BR as the 1972 dated parts book would suggest.

Courtesy Danny Tarquini
Courtesy Danny Tarquini.
1969 COPO 427 Chevelle. Note the 429 coil is not a Chevelle number but since the COPO's 427 was the full size L72 engine and not a typical Chevelle engine, this is a distinct possibility. A little hard to see but the letter "y" extends below the baseline on this coil.

Anyone with photos of original coils not shown or listed is invited to share.