are you wanting the cage for competition? If so make sure it's fia approved, i know if you buy the cage from custom cages chizfab can weld it in for £500, only problem is i don't think it would be fia/msa approved, if you want it approved he would need to weld a sample piece to be sent away and strength tested. Apart from custom cages i don't know of any that go to the strut towers