Abstract: Disclosed is a kit of resilient blocks and an assemblage thereof for positioning and supporting a patient for spinal surgery. The blocks have hook and loop fasteners for securing them in the assemblage in their required positions. The blocks are shaped and dimensioned for different patient sizes and different curvatures of the patient's spine so that the assemblage of blocks may be customized to the individual patient's size and shape and the requirements of the surgery. The blocks include a base block, a U-shaped block, inside and outside filler blocks, face and chest blocks, and a pair each of flexion, lordosis or neutral blocks. The nature of the surgical procedure and the size and shape of the patient determine the size and identity of the blocks to be used. The base board and blocks are radiolucent so that X-ray fluorescence may be performed during the surgical procedure both P/A and laterally.