This is a set of Minoura car mount components. Normally, the rail length is fixed, but it has been replaced with a separately sold slide rail (800mm-1,200mm), allowing adjustment to fit the length of the car's interior. I confirmed the setup at home once, but it has not been used in practice. It can secure two bikes with thru-axles. Reference (Retail Price) TA2-WH: ¥19,250 Slide Rail S: ¥9,680