When I previously fitted the doors to test the openings, nuts where used as the condition of the brackets was poor (see below).

Rather than purchase new brackets, I undertook a mini restoration.
First I removed what was left of the rusted bolts.


Some of the threads where ok.

In the damaged threads I just drilled them out with the idea of welding on nuts.



Unfortunately, whilst I could melt the weld to the nut, the bracket would not have anything to do with it!

I may have another go later or just use the bracket as a washer.