I would also check with SWFA, they are my go to for optics. I always buy caps with the scopes as they have them on hand (usually) and is easier that way.
I think it is the Butler Creek that flip up, may be other makes also. SWFA should have them, they have for everything else I bought from them over the years.
Maybe if you added that scope to your cart at SWFA it will show the caps that should go with it? Or, email/call them if you still don't have an answer after Christmas.