I agree with the above. You really need to post this on the P.38 forum at
www.p38forum.com . They would also advise on this as well.
As a P.38 collector, I must say that the hard shell holster is absolutely okay with the gun-just not "period correct" if you will. Or, let's put it another way: The holster and gun would not have been issued together. More like the soldier would have had the holster already for a while and then was issued the P.38.
That's my judgement