Agle Iron pieces supplied with Mira Low Flight Shower Tray

I got two pieces of 20mm metal angle iron supplied with my Mira shower tray. The tray is 1700 x 760mm and the two pieces of angle iron is thick section and 1500mm long. I'm not sure if they should be installed under the longer edges or if they are supposed to help in sliding the tray into position. Can anyone help please?

 

Hi Dave. I've read the instructions and they're not mentioned at all. There aren't any screw holes in them either.

I've emailed Mira but I don't know how long they might take to get back to me.

 

Mystery solved. Young lady phoned from MIRA showers. Apparently the angle iron is just for shipment purposes. I don't know what they do as they were sealed in a plastic sleeve but I'll give them to my local scrapman. Thanks everyone.