THIS IS NOS VINTAGE ORIGINAL 80S SR MS-422 BMX STEM NECK IN SILVER. USED ON 85 MONGOOSE CALIFORNIAN 1985 EXPERT AND WILL FIT A LOT OF OTHER BMX BIKES. THIS ITEM WAS FOUND WITH A LOT OF OTHER BMX ITEMS WE FOUND IN A OLDER WAREHOUSE, WE WILL LIST MORE ON EBAY SOON.