What are the differences in all of the different AFM's? Is ther any difference other than the part number?

It seems that they have a different part# for each year of our trucks.

Could it just be good luck that the Supra AFM worked in this case?

Thanks again
Ken


89 Ext cab 22RE 5 speed
84 Ext cab 22R 5 speed
88 Mitsubishi Macro Cab 2.6 5 speed