We’ve recently switched manufacturers for this tank. The one you have resembles an older in-house model, but it’s hard to confirm. Our original tanks mounted on the bottom of the cross-members, and we also had some powder-coated ones that did the same. Tanks with the CPT logo on the bottom of the tank have front tabs that sit on top of the cross-member and rear tabs that mount underneath. Ultimately, as long as everything fits, the specifics aren’t crucial. We were just trying to make it fit better for sagging body mount Scout II's.