Hi Svenn
There have been several very good threads on the Battery Tray, Battery Hold Down and Battery Box Cover.
If you haven't found these on my website here is a place to start
http://canadianmilitarypattern.com/PostingPage3.html since I posted this I have done some more drawings which I will try and get posted soon.
There are 519 MLU post and threads mentioning the phrase "Battery Box" who can point us to the most recent one covering Chevy Pat 13s?
Question Svenn do you have the plate that the battery box sits on or do you need information on that as well?
Cheers Phil