Msc68 MP40. Very early serial # in 4000's. Missing detonator & has chrome trunion?

Okay so I'm a machinist and I can turn up a detonator that somebody posted the blueprint of but what kind of rounds duo I need to buy in the picture I've posted?  Thanks everyone..
Also are those venting hold locations critical? I really hate to have to set up a whole mill for those two tiny holes. When i can drill press them in and then chuck it up in the lathe and run the short program i wrote..
Adam

Hi, not really sure what you are asking about rounds required as the pic is for caps that all rounds use. The det pin is for MGC P220 rounds so is it size of cap you need to know? if so its the 7mm, MGC caps dont have many sparks the flame caps have loads thats the only differnce in the caps.
The holes in the det pin allow smoke to vent through the barrel so if you have an open barrel then yes you need the holes, if the barrel is blocked then you dont.

Hole location is not critical - they serve to let smoke through to the barrel.
Only reason for location could be structural - for example when positioned on opposing sides, the whole part is the strongest.