Leaf Spring Bushing question

[70Chevy4x4Nut]

I know someone out there knows this. I am replacing rear leaf spring bushings on a 70 1/2 ton 4x4. The bushings I bought have not come in yet but are supposed to be for the 1-1/2" OD leafs. I finally managed to get the rubber and the inside sleeve out and there is still a thin outer metal sleeve left in there. If I remove that I will have a 1-1/2" hole, if I leave it it is 1-3/8". Is this sleeve part of the old bushing that needs to come out? And will the new poly bushings just fit inside there without a sleeve or will it come with a outer sleeve of it's own?

Never done leaf springs before and I need your help.

Thanks