Unibus font please?

So im trying to figure out what font this may be.

It is from the UNIBUS logo

I think the part that says “UNI” is Gill Sans Nova. Can someone confirm? I’m mainly looking for the Font(s) in the word “Bus” Thank you.

UNI is Gill Sans Nova Ultralite, B and S are Gill Sans Nova Heavy or ExtraBold. The U is customized for the logo.