As I replaced the hot bed holder with a much lighter version it also required to have 4 slider blocks instead of the 3 one. So I did a quick design for the Igus RJ4JP-01-08 sliders.
The sliders can be pushed in easily and are snapped into place with two small guides.
Four M4 hex nuts are needed per slider block as well as four M4x8 screws.
Added another slider block with 15mm inner diameter so the Igus sliders could be fit better when the block is printed with Prusa PCCF filament for example.
The author hasn't provided the model origin yet.