Pulley Mixup

[sjarrett71]

The power steering pulley I have on my pump is flat and it appears I needed a crank pulley that is cast like the one in this picture:



I have the three groove crank pulley and would like to change my power steering pump pulley to one like the offset one in this photo:



My question is this....Are the ones you can buy in the aftermarket the same as the one in the second pic and do they mount the same, with the keyway and nut on the outside or do they press on?