I installed some new sliding pocket doors in the house and I did not like the little plastic guide block hardware it came with....these guide blocks fit at the bottom and make sure the door does not swing and hit the walls. The last picture above shows the standard blocks that come with the door; they are ugly, and protrude out into the door way area. I decided it I would just make up my own that fits nice and flush. It is specific to the width of the opening, but can be scaled up/down to adjust any opening I suppose. I printed it in natural white ABS and it works/looks great. Much better than the original part.