I converted a right hand years ago with the parts you mentionef. You will need the small bolt head parts also, the extractor, extractor ball, ejector, their springs & ejector retainer pin. I can't recall seeing serialized numbers on a bolt either.
Headspacing can be accomplished on all setups so their excuse is a non-issue as far as I would guess.
There are so many inexpensive used actions available now it may be wise to consider one of them where parts availability I'd better. The pre-66 trigger is not bad & adjustable but if you ever need parts they might be impossible to find. The newer actions have aftermarket triggers available at reasonable prices.
IMHO,
Randy
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