As Diana says.
Series 1 and probably S2 had sherardised bolts and nuts and washers, as far as I know now unavailable - although it is possible to do these yourself if yoou are keen enough! Later ones had galvanised, and these are available, probably special order and by the box (I don't think you can get nyloc nuts galvanised).
Zinc plated fasteners are only slightly better than black steel in this application - stick out for galvanised. If you live right on the coast, there may be a case for using stainless, but you should ensure it is electrically insulated from the aluminium using neoprene or nylon washers and short tubes where they go through the panels.
If you use any of various antiseize compounds they will ensure you can undo the bolts next time.
Several years ago I completely disassembled the body of my 2a to repaint it, and probably twisted off half the bolts. A very few had to be ground off or drilled out. I used some new fasteners, but mostly were reused either from it or another one I stripped a few years earlier. As they were reassembled using antiseize, the ones I have had to disassemble since have proved to be easy.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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