Hey everybody, so I just picked up a solid axle to eventually do a SAS and the guy that sold it two me gave me two sets of Aisin hubs with it (neither were on the axle) but when I went to take it apart I realized they were slightly different. The axle is from an 83 pickup and two of the hubs look more like the ones on my 86 IFS while the other two look different. I'm wondering which ones I should go with on my axle when I do the swap? Or if it even matters? The face of one is more flat while on the other the middle red parts stick out a bit (see pictures)

 

I believe the flat face ones are for IFS hubs. The other ones I believe are SA ones. You'll need to use the ones that match your hubs.

 

I just looked at my hubs on my 85 FJ60 front axle and the hubs are raised which is in agreement with what vital22re said.