These frame boxing sets are made to work in conjunction with our Cummins motor mount kit. It boxes the frame rails in from the steering box to the transmisssion cross member. Fabrication and welding are required!You must replace the two factory front cross members, it also comes with machined dom sleeves for the steering box and hardware. The item "Rob Bonney Fab 73-87 K10 K20 Chevy 6BT Cummins Conversion frame boxing sets" is in sale since Monday, March 18, 2019. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Motor Mounts". The seller is "robbonneyfabrication" and is located in Peoria, Arizona. This item can be shipped worldwide.