There are some other numbers, but the 207 was the only one available over the counter.
Read here
http://www.tispecialty.com/articles/article4.htm
and here
http://www.tispecialty.com/articles/article4list.htm
The red coils off the factory C.D. ignition used on Chevy, Olds and Pontiac may work too, but that's only a "maybe".
