Poly cab mount ??

[Destro]

I bought new poly mounts for my 77 4x4 1/2 ton. They didn't come with any metal sleeves for where the bolts pass thru. I got some metal pipe to make my own to put in there. So I guess my question is "Is there is supposed to be metal sleeves inside the poly cab mounts??" The originals are so bad I can't even tell.
Hope someone can help me out.

[Blazin]

You can buy the sleaves form GM still, as well as the lower cup washer that go on the bottom. I have made my own by welding tube to the original top flat washer after grinding off what was left of the old ones.