An alternative to galvanising is hot zinc metal spraying:~
Briefly the part is media blasted prior to the above being applied- accepts paint (correct primer) then topcoats.
(Repair first or the above treatment will be wasted)
I have used this process on a 70 year old Riley chassis & quite a few other associated parts, the first company had been a metal spraying one (now closed) but I also use a company restoring narrow boats.
Parts had been done over 30 years ago and are completely rust free to date.
Prices have been very reasonable... the classic car interest from them helped.
Could be an option if you choose this route?
Good Luck.
Bob.
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