Agree the numbers seem off, especially the 3905572. 3939198 superseded the 3859194 shown in the 67 AIM, around 2/69. Can't say for sure as my car is in resto, but looking at the 3939198, my disc car with 3905572 seemed to be a little taller, slightly curved, and skinnier at the base. Dimensions for 3939198 are given as 1x1-7/8x2-15/64. I'll check, but not sure if I have any pics.