Big Mal at Currumbin do customs but I don't think it would be that hard to cut one down & probably be a cheaper alternative.
Surfaids Byron Bay, Graham will make anything you need in either 5mm or 10mm padded, straps, zips, velcro ...whatever you design
www.surffx.com.au/product/2019-duotone-single-boardbag-twintip-2/
This is what I used $99 for my last trip to Fiji absolutely perfect for my 4-11 , it's better to have some extra space for mast ect , the bags come in heaps of different lengths.