This product is either discontinued or we cannot get that from suppliers.
Intel FUP4X35S3HSDK, Storage drive cage, Expansion Bays 4 x hot-swap - 3.5", Bays 4 x hot-swap - 3.5", Backplane, I2C jumper cable, ID filler, 4 x hot-swap drive carriers.
Intel 4x 3.5" HDD Towerserver Hot-swap Hard Drive Cage Kit.