There are a number of differences between 28 and 29 model A's including pickups, mostly minor. The radiator shell is different, 28's have a single bulb in the headlights, normally 28's have a powerhouse generator, 28's typically have red steering wheels along with other minor differences. However, early 29's like my January phaeton carry over many 28 features. It has single bulb headlights and a 28 radiator shell, among other 28 features like the body mount taillight. Most of the changes between 28 and 29 were minor and it is sometimes difficult to tell them apart.
Rusty Nelson