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
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein