You should also measure the distances between the mounts and the lengths of each leg, the Hilux frame may not have the same profile where it curves up over the rear axle and where it turns in towards the engine sub frame. Hope my descriptions make sense. The custom super long frame I think just had length added under the cab in the straight part.
'91 Pickup - Imelda
'08 Tacoma TRD - Donna
"Hey Macarena!" -- Thomas Jefferson