I think most rubber bushing applications are based on the torsional strength of the bushing (because they don't rotate in the housing, but rather deform, or shear), and not as much on compressive strength, hence the need to tighten the installation of the rubber bushings at the normal or expected ride height, instead of at full droop. I didn't comment earlier, but my thoughts were to use a thin poly sleeve bearing on either the ID or OD of the bushing, allowing it to rotate in the housings, yet provide the more compliant attribute (???) of the rubber, or now hybrid, bushing. With the housings used in the initial post, I can't imagine the use of a rubber bushing due to insufficient wall thickness to perform as standard rubber bushings do, and if one chose to allow the rubber to rotate in the housing, I can't imagine it lasting very long. Poly bushings, even without the specialized lubricant supplied with them, will rotate within the housing with much less degradation.