As above you can use any HQ-WB ute or van chassis. HQ-HX are more prone to cracking, so check whatever you get first. They crack on the welds at the rear of where the lower control arm brackets are welded on and around the shock tower. WB you can't use the front bolts on the front bar. Just be careful with HX-WB chassis too, as you may have to retrofit ALL pollution equipment to the HJ to register it. If this is the case it may be better to repair the HJ chassis using most of the HX chassis, if you get what I mean. Talk to a panel beater on this.