Looking for an Asset is used to use but can't remember it's name

Evening all, I have recently started playing again after a few years and am really enjoying the game. I am looking for an asset I used to use but cannot remember its name for the life of me let alone an image just a description if this resonates with anyone?

It's white blue and potentially or orange and it looks kind off like a hangar/tunnel really want to find it now I can't. TIA