What size glass do i need for print-bed? (Duplicator-i3)

[peps1]

I have a Duplicator i3 in the post and was wondering what size glass i need for the heated print-bed.
http://www.wanhaouk.com/collections/.../duplicator-i3

The unit Has 200x200x180mm print size

But, as it has carriage bolts on the corner 200mm will be too large to have the glass sitting flush on the heat bed.

Anyone have a Duplicator-i3, and can recommend glass size?

[printbus]

Common problem with many printers that use the Prusa style heat bed with mounting holes. Options I know of are to buy glass with the corners rounded (eBay etc), buy window glass and cut the corners diagonal to clear the hardware, or use a rectangular piece of glass that sits between the rows of screw hardware.

On my MakerFarm i3v, I use 3mm window glass cut to the size of the heat bed. Corners were cut diagonally to clear the bed hardware, and I use mini-sized binder clips to attach the glass to the bed near the diagonal cuts.