Exhaust shield bolts/nuts?

[Gubro30]

I happened to have lost two of five nuts holding down the heatshield, and can't find a thin enough replacement at every hardware store I've tried. Any suggestion/solution? Thanks!

[Rick G]

I had to buy some a while ago and this was where I finally got them http://www.motobins.co.uk/bmw-parts.php?model=K%20Series