Item 68482 at harborfreight.com. Dunno if I would skimp on something this important or trust my prized vehicle to it, but the price is pretty attractive. Think I paid $3300 for my Rotary 10K lb asymmetric two post. In the Torin manual, they show both symmetric and asymmetric assembly instructions. Dunno if the supplied arms would support asymmetric configuration (rear arms are significantly longer).