Hello, jagdafrika
The task of finding this out is fairly simple and can be done by using purely online resources for the period from March 1942 through May 1943.
1. Go to Michael Holm's website at:
http://www.ww2.dk
2. From the units listed there make a list of those that you can see operated in your theatre of interest and for the interesting timespan
3. For these units go to the links provided on the bottom of each unit page called 'Flugzeugbestand und Bewegungsmeldungen'. In these you will find the number of aircraft delivered to the respective units for a given month, and the category (new/repaired/from other unit)
For the period from Dec 1940 through Feb 1942 you will have to resort to other sources, my main source would have been:
'Tägliche lieferungen an die Luftflotten' (BAMA signatures RL 2 III 611 - 619) which is a day by day account of all aircraft delivered to the different Luftflotten from May 1940 through December 1944. These documents have a spreadsheet-form overview of aircraft models and numbers reserved for delivery to a given Luftflotte for a given period of time (see link for example)
http://www.ahs.no/discussion_images/...gzuweisung.png
PS! There are also lots and lots of additional deliveries filed as small notes (see below links for example)
http://www.ahs.no/discussion_images/...additional.png
Regards,
Andreas B