There is a link that shows the #12 Don Fowler drove on TXTOM's post #287 at Tx Racing History, Old Modifieds, pg 12.
The first night that Speed O Rama opened in 1960, they had midget races. Parked in the infield there was the #12 purple and white that Don Fowler drove and the #22 that Waldo Harper drove. During intermission they did some hot laps. They were faster than the midgets and a lot louder and I've been hooked ever since.
There are several more cars from that era on Txtom's post.
I have a picture of the #12 when they put the roadster body on it in 1961. Painted lavender and white, Ford powered. Buddy Yanis and Don Fowler both drove the car.
Rodney