I took the measurements from my genuine Landrover Service Manual. It states that the measurement between the 2 inside bumper fixing holes should be 66.3cm, and the chassis rails should be 78.7cm. My chassis is 65.5 & 78 respectively. I bought the chassis about 3 years ago & had it shot blasted, it was in really good condition, only having a new rear crossmember fitted previously. There was no other sign of any welding, so no it has not had new dumb irons. I need to take some more measurements. It's a shame I didn't measure it before I fitted it up! Everything else fitted OK. I wondered if it were possible to stretch the front chassis rails out slightly? Obviously I need to find which chassis rail is out.