if you have drilled out the spots on the body then use them to plug weld the new assembly in
if you have drilled the spots on the bit that you removed then you could if you can get one spot weld
2 methods to plugs, 1 set welder up as for normal and start on the centre of the back metal and run the bead as a spiral or till it fills the 8mm hole 2nd method ramp up the power to 100A and turn the wire speed right down hit the centre of the 6mm hole with the big buzzin arc till its a big flat spot
practice on scrap and practice more then just do some test practices ...you get the picture
the 2nd is almost indistinguishable from the resistance welds, the first needs grinding both need clamping tight which is pretty difficult in the bulkhead area.
neither will work if the 0,5mm bulkhead steel is pitted dirty oil soaked or have remnants of PU stone chip
its not the bulkhead but the lip under the hinge are mig spots the ones on the hinge are resistance welds
bonnet hinge repair by Sean602, on Flickr
