Either the hard hubs for the TF-4 (SPW-123, available with 0 and 2 degrees toe-in) or the hard hubs for the TF-5 (TFW-002). You'll also need a different size of universal (W-5063 or equivalent). However, it is possible those alloy hubs are not up to the task of handling a heavy 4WD buggy instead of a light 2WD buggy or on-road car. You may have to try the Lazer ZX-5/6 aluminum hubs instead, which were specially developed to replace the original ZX-5 plastic rear hub (which was the same design as the plastic TF-5 rear hub but broke a lot on the buggy).HKS_TRD wrote:Is it possible to fit them to a Lazer using different hubs, if so which hubs are required
Although I'm not sure why you'd want to try, as the Ultima RB Type-R rear arms are rare as hens teeth and the length of the arms is the same AFAIK...