the 69 had four and the 70 had two headlamps..they weren't much different from the regular line, with it's annual update..
Boss 429 - Wikipedia, the free encyclopedia
The Boss 429 was a high performance Ford Mustang variant offered in 1969 and 1970. ... The Mustang's body however was not wide enough to encompass the massive ...
http://en.wikipedia.org/wiki/Boss_429