Howdy,
I recently got a hold of Heritage Aviation’s 1/48 Pucara kit. Doing an inventory of the parts, I ran into a clear vacuform blister that has three structures on it:

I have no idea what structures A and B can possibly be. I think structure C is the front lens of the underwing weapon hardpoint. There is nothing in the instructions that remotely looks similar either.
Has anybody built this kit before, or knows what these things are? Any help will be much appreciated!