Hi Norbert,
probably the easiest thing to do is to either e-mail or write to NARA in the first instance, stating that you want a quote to photocopy the two KU files. Note however, if you live outside of the US, that this sort of enquiry takes time and in my own experience, my first request took around four months from initial enquiry to receipt of the photocopies. I recently hired a researcher to visit College Park and photograph the remaining files I needed, this proving to be much quicker...
The relevant contact info is:
e-mail - via the NARA website
http://www.archives.gov/contact/inquire-form.html
snail-mail -
National Archives and Records Administration,
8601 Adelphi Rd,
College Park, MD 20740-6001
UNITED STATES
In both cases, besides, quoting the KU report numbers, also state that these reports are a part of "RG 242 Captured Luftgaukommando Reports on crashed Allied Aircraft"
If you want to get a researcher to obtain the relevant copy, then the following link on the NARA website has a list of independant researchers who specialise in military archives:
http://www.archives.gov/research/hir.../military.html
Cheers
Rod