Look this stuff about altering a new plane before its first flight is ...........well I can only say silly. I have yet to build anything without improving or altering something to make it better and more service friendly. I usually ditch most if not all of the hardware in favour of US standard. I don't know if its true or not but I have heard these off shore companies are famous for buying up obscure hardware and using it in their kits because they get it for pennies. When its gone they look for something else to do the job. No consideration for the poor sucker who is trying to replace any broken or missing stuff. You may find this out if you were to contact them about replacing this hard to find stuff.

Your going to open up the minor diameter a few thousands and the tap you will be putting down is the same thread pitch how hard can it be???????

11 bucks an eye bolt man you can buy the drill, tap and a couple of dozen bolts for that price.

Have at it and good luck.