KNK Force Guides for mat

The KNK Force has a slot with trapped nut for some guides to keep the mat or material straight. For some reason these guides were not included with the machine. I saw another design http://www.thingiverse.com/thing:1638757 but the tabs were a little bit big and had to be filed down. I designed these to be a bit longer with a snug fit. Light file may be needed but the final version fit very snug on mine. The poorly printed top was my printer being to close to bed on first layer.

This is my fir