Ok ,Im sure this has been discused here before,but how do you know if you need to install a spacer on your steering shaft?

I ordered calmini's 3 body lift for my 94 trackick and don't know if I need a spacer or not.
If I do need to modify my steering shaft does anybody know if the boondox spacer will work?

I realy don't want to cut my own and weld in a spacer like calmini told me on the phone.
sorry if this has been discused here before......as you can see Im a noobie

Thanks for the info
Tj