transmission mount bolt sleeve size needed

[DESTRO]

Hello all
I'm trying to hunt down the size of the sleeve the trans mount bolts go thru.
It's a turbo 350 mounted to a np203 in a 77.

It's the sleeve that passes thru the two rubber mounts on the crossmember that the bolt passes thru before it his the threads into the adapter.
Replacing the mounts but the sleeves are missing and need to make a couple,just need the outside,inside diameter and the length.
I really hope someone can help.
Thanks