I'm guessing that the 375ml bottles will work for the finals? I don't have my score sheet yet, but I'm sure I got dinged for lower Carbonation. It was my Triple in Indy. I've never seen the bottle measurements. I was worried about putting 3.5 volumes in a standard bottle. I guess the pint bottles Ayinger uses would work as they are thick?
Here is the final word on bottle sizes, I'd measure your 375ml as I think they could be too large in diameter - I know the ones I use for cider are - its annoying that there are so few sources for stronger bottles that fill these requirements. I don't thing the standard Weissbier bottles are accepted either- too wide
Container Size & Appearance
 Hold a minimum of 10 ounces (296 ml) in volume.
 No more than 2.75 inches (7 cm) in diameter and no more than 9
inches (23 cm) in height.*
 Flip tops and 22 oz bottles are not acceptable.
 Must be free of ink, paint, or paper labeling other than the
competition entry label.
 Bottle caps must be neutral i.e. no lettering or graphics.
Number of bottles
*Please note that we put these guidelines in place because all entries need
to fit into a standard longneck case box slot. Please check to make sure your
bottles fit in a standard case size box before entering.