ACCESSORY KIT, 2.5" MAX WIDTH CLAMP MOUNT WITH 1.5" DIAMETER BALL DOUBLE SOCKET ARM AND 2.5" ROUND BASE (AMPS HOLE PATTERN), CONSISTS OF A DOUBLE SOCKET ARM, ROUND 2.5" DIAMETER ROUND BASE AND 2.5" CLAMP BASE, SQUARE RAIL MOUNT RAM MOUNT PRODUCTS HAVE A 10-12 WEEK LEAD TIME.