If you are looking for "period correct" items that match the neat pistol you just got, I absolutely understand and as a matter of fact... I did exactly the same thing many months back to go with my 1964ish five digit SN Model 39 no-dash also. In my case, I simply swapped some items with a buddy, he had gotten them in a Gunbroker auction.

However, it seems worth noting that -all- of the 39 magazines (metal floorplate and plastic follower) and also the larger capacity 9-rd 3906/952 magazines will also fit, feed and function perfectly well in even a no-dash Model 39. These magazines are easily available in many places and definitely on Gunbroker.