Would they be the same as a 98 Mauser?
They should not be too hard to find or to make , I took mine out of my (Argentine) FN49 and measured them for you-- thread 3mm,lenght of thread 4mm, overall length 7mm,diameter of head 5.5 mm, head is 2.3 mm high.
Acklands or Bolt Supply might have something close.
Good luck



























