Hi,
there are different length and options for igus. You can buy a longer piece and get a workshop to cut it to 2 halves. One long and one shorter version.
Here's the part I used for my Igus Slider
Igus parts bought locally:
Rails
igus Drylin W Slide Double Rail part # WS-16-60-1000
Length : 1000 mm
Carrier
igus Drylin W Carriages fitted part # WW-16-60-10
It's about $110 for both.
Here's the contact:
Phone: -+65 6487 1411 Ext. 833
E-Mail:
JChew@igus.de
Internet:
http://www.igus.de