These are improved y-slides for the Smartrapcore Alu (might fit the wooden verison but I can't be sure).
The improvements are improved clearances for the belts to allow use of f608zz bearings instead of the printed pulley sleeves.
Also the L slide has a hole for mounting the x-endstop to the slide rather than the x-carriage/print head, as I found the endstop on the bottom of the carriage makes using an e3d v6 more difficult (and I wanted to mount LED's to this area).
Photos of these parts installed enclosed, the photo of the L slide is from the back to show the endstop mounting.
UPDATE 22-06-16 uploaded the 4 clamps which hold the rods in place, you'll need to print 3 of the reinforced ones, and one of the ones with the tab for your x endstop.
Printed in ABS needs to be fairly strong.