Meier Gun Works used to make a Mannlicher bolt handle, but I understand they are out of business now. They were in NM, IIRC.
I think Midway bought up their remaining stock.
A 5/8" dia round stock bar is a good starting point for filing out one on your own. Do a search for spoon or butterknife bolt handle and there are quite a few pics of the now unavailable ones to go by.
Check with Springfield Sporters in PA for suplus M/S miitary parts. They used to have a bunch.
http://www.ssporters.com/They list a mainspring and extractor (Portugese Verguerio, but it can be fitted).
Email is usually (very) slow with them. Call if you want a quick response. Like everywhere else,,not everything on the list is in stock but I've had excellent luck with them in the past buying parts for different firearms, especially Webleys.
A Greek Military bolt MAY need to have the bolt lock 'V' peak filed into it before it will fit into the commercial receiver.
Not a big job,,they just left that feature off of the Military rifles. But there is still metal behind the bolt handle base.
Sometimes the military bolts will just ride right past the bolt lock spring of a commercial receiver depending on how that little area was shaped down during mfg'r.
It usually puts unwanted stress on the bolt lock spring as it's held in un-necessary outward tension with the bolt closed though. Better to cut in that small detail and save making a new bolt lock spring too.
Here's a couple more pics showing the difference in that area between a commercial bolt and a military M/S (Military has had it's handle bent down when built into a sporter,, otherwise unaltered.)
..and a couple that show the rest of the assembly is the same.




FWIW, I have both Commercial and Steyr Greek Military sporters and the bolts will interchange from rifle to rifle.
The is NO guarentee the headspace is anywhere near correct though!
M/S's w/loose headspace even with the matching bolt seem to be quite plentiful for some reason.
Added....Though that handle on the bolt coming along with the rifle would be tempting to scavenge,,I do think that bolt
assembly is a Kar 88 (carbine) bolt.
If it is, it's a very hard to find Military part. Being matching numbers all the better.
Kar88 bolt assemblys in nice condition usually bring $200 and up.
A simple item to list on Ebay if you want to and recover some investment costs.
The standard GEW88 (rifle) bolt assembly with the straight handle round knob usually sell for $50 to $75 as they are the common type.
They came on the tons of Turk marked 88 rifles that flooded the market few years back too. Many were stripped for parts.
There are also quite a few
Chinese mfg GEW88 rifles around. Same GEW88 bolt,,but no KAR88 style flat handle bolts that I'm aware of for the Chinese products.
(Built on German machinery gifted to the Chinese after the adoption of the Mauser 98)
More than you wanted to know most likely..