I have a extra HHA .019 2" (XL-7551) rehostat housing I'm going to sell for $45.00 plus shipping. I checked with HHA and this housing should fit all the HHA sights. I ended up paying $95.00 and buying a new one with the Armour pin. The only problem with the armour pin rehostat is the fiber optic is less than 10 feet. I love the bigger two inch housing of the XL5519. (That's what my extra rehostat is from)