[Lynn Eades]

I'm not sure that its armoured but if it is, you can weld it with stainless.
The carriers are made out of metric plate ie 3mm 8mm. If you are talking about the front plate that un bolts to give you access to the pedals etc. just cut a new one out of mild . If you going to join it, cut it back so the join is hidden under the angle. When you take the plate out you'll be able to measure it.