The bolt holes on the Curt Trailer Hitch Receiver # C15302 sit across from each other 39" on center and are separated front to back by 7-1/2" on center. This is a custom fit for the following vehicles:
2008 - 2010 GMC Sierra 2500 - 6-1/2 Foot Bed
2007 - 2007 GMC Sierra New Body 2500 - 6-1/2 Foot Bed
2008 - 2010 Chevrolet Silverado 2500 - 6-1/2 Foot Bed
2007 - 2007 Chevrolet Silverado New Body 2500 - 6-1/2 Foot Bed
2001 - 2006 GMC Sierra 2500 HD - 6-1/2 Foot Bed
2007 - 2007 GMC Sierra Classic... view full answer...
The distance from the top of the receiver to where it would mount on the bottom of the truck is 6" on the # C15845 Curt Trailer Hitch Receiver. The distances between the mounting bolts vary so I am attaching a picture showing the different measurements you may require.
I have also attached the installation details for your reference. view full answer...
The base part # BWRVB3055 measures 18 inches wide by 18 inches long and is designed to mount in an opening that measures 20 inch by 20 inch.
The B&W Companion Flatbed Gooseneck-to-5th-Wheel Trailer Hitch Adapter # BWRVK3050 is what this is the base of and is intended specifically for use in trucks that have their gooseneck installation kit # BWGNRK1500. This gooseneck hitch has a square opening that accepts the square shank portion of the 5th wheel adapter. view full answer...
The width of the tab you marked in your picture is 2.9" and the height is 6.32". I have attached the full dimensional drawing of the # 3371809065 below for your reference. view full answer...
While the Buyers Products Fabricators Hitch Plate # 3371809027A does not carry a weight rating, their custom fit hitch plates are only rated for 20,000lbs. Since this is a fabrication kit you will be able to add more steel and additional mounting points to increase the hitch strength and be able to bolt on the Buyers Products 30 Ton Pintle Hook # 337PH30. I recommend having the plate fabricated and strengthened at a shop experienced in this work. view full answer...