I believe they could be ordered from the factory but both were in the option book. Cruise around this website. Lots of good info here. Click on Library in the left column. Then click on 1965-1969. In the 1966 column a little over half way down click on ordering information. I see the flasher option but not the park brake light. Have fun! http://www.hamtramck-historical.com/library-2.shtml