The patch panels for M37 front fender repair are available from Charles Talbert of M-Series Rebuild. He has a web site with his business information and contacts. These were not available for some time and then Charles stepped up and had a bunch run off. He is very knowledgeable on all things M37 and generous with his help.
http://www.mseriesrebuild.com/
M-Series Rebuild LLC
4038 Shankle Road
Norwood, N.C. 28128
Phone: 704.474.4683
Decent used Fenders are available, and I suggest you try Marc who is closer to you at:
militarypowerwagon@bell.net
For M37 you can try this forum with members all over the world and many in the east.
http://www.g741.org/PHPBB/index.php