This is a genuine Gibson replacement part, the "BR-055," which I acquired about 30 years ago. It's a set consisting of a chrome-finished ABR bridge and a rosewood base. The base has no threaded holes. It has been stored unused, but the red backing card has faded considerably due to age. There are stains on the back of the card. There are traces of a price tag having been removed, and dust has adhered to the surface of the transparent film packaging due to the unevenness of the parts. The packaging shows its age, but the parts themselves appear to be in good condition. Although the packaging has deteriorated, the parts themselves are unused, so the product condition is listed as "new/unused." I am unable to answer detailed questions regarding size or compatible models. I will not be offering any discounts. Please understand. I welcome your consideration if you understand that this is an old, genuine Gibson part. It will be shipped via Yu-Packet Post. - Brand: Gibson - Model: Bridge Thank you for looking.