Brake booster Boot part number? ( with pictures )

[C10wip]

I got a used boot from Cardone ( for free, thumbs up to them ), but it would be good to know this part number and I couldn't see it in any of the usual places. Here are the pictures. The inside diameter of the round end is about 1.925 inches. Theends look like they will fit the booster and firewall, but is has kind of an odd offset and is canted at an angle. I'll try and fit it in this weekend.
I am guessing there are any number of names for this, but the number would be useful.