Trotsky said:
"are 74 and AKM extractors and firing pins interchangable?"
No - different extractors, generally different pins.
Advice on '47 bolt spares - I would just pick up a Bolt, complete. You're likely to find that it's only a LITTLE more than separate parts... and it gives you a new bolt body as a first line defense against excessive HS issues.
<sigh> That's kind of what I'm thinking as well. K-Var sells complete East German AK 7.62 bolt for $67.99 and a rebuild kit (includes firing pin, firing pin retainer, extractor, extractor pin, and extractor spring) for $30.89.
I don't want to sound like I'm obsessing over this, but you guys know how surplus is: one day you are drowning in guns/parts/ammo, the next day you can't buy it for any amount of money. I think I'll do a combination of extra bolts and parts.
Thanks for all the replies!