I'm sorry, your post was cut off. I'm not sure what your follow up question was. I also can't make out the size of the socket opening based on your picture.
The opening appears to be approx 14-15 mm. It fits snugly. I'm guessing any of your offerings in the "rear drawer socket" category that look similar should work. Provided they are wide enough.
I have half a mind to order pairs of each kind! I also realized that the sliders themselves have holes which I could used to screw in wooden blocks wedged behind to provide additional support and take the strain off the sockets themselves!
Can you confirm the size of the opening? 15 milometers is approximately 19/32", which is very small for a socket opening. You can see detailed dimensions for each pair of sockets we carry on our site to use as a reference. Otherwise, I agree: there's a good chance one of ours may work, assuming you find one with the right opening size.