- Part number oap discontinued, we will not accept any more parts orders for the old part numbers, please use new part number C-HDM-409 - Tube offset adapter plate - Adapter plate attaches to the top of an angle bracket on any C-HDM-100 Series base to allow the offsetting of a solution by 2.5 inches - Typically used to create a fixed mounting location that does not interfere with critical dash controls - Material: heavy-duty construction for rugged durability with black powder coat for anti-glare and rust prevention - Height 1: 0..180 in, height 2: 6.25 in, width 1: 3.5 in