I have an HHA Lens Kit B 4X for sale that is like new! I put it on my sight for one day to shoot and then took it off. I could probably sell it for new and you would never know, but that would not be right. Comes in original box. This lens kit is for the Optimizer 5000 sight. Kit contains the lens, retaining ring, rubber o-ring and screws. Fits all HHA 1 5/8” Sight Housings. I will post photos later on when I get home. I paid 80.00 new but I will take 60.00 TYD. My loss could be your gain! PM if interested.